diff --git a/CMakeLists.txt b/CMakeLists.txt
index 332577a..2a8d8a1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1,13 +1,9 @@
 #cmake_minimum_required(VERSION 2.8)
-# cmake_minimum_required(VERSION 3.5)
 cmake_minimum_required(VERSION 3.14.0)
 
 set(CMAKE_C_COMPILER "gcc-4.9")
 set(CMAKE_CXX_COMPILER "g++-4.9")
 
-# set (CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")
-# set (CMAKE_LINKER_FLAGS_DEBUG "${CMAKE_LINKER_FLAGS_DEBUG} -fno-omit-frame-pointer -fsanitize=address")
-
 project(markup_tool)
 
 # set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -std=c++14")  #  -stdlib=libc++
diff --git a/markup_backend/include/markup_backend/markup.h b/markup_backend/include/markup_backend/markup.h
index 0af64d6..845cd63 100644
--- a/markup_backend/include/markup_backend/markup.h
+++ b/markup_backend/include/markup_backend/markup.h
@@ -17,7 +17,7 @@ struct PipelineRunParams {
     std::string tracker_model_path = "";
     std::string weights_path = "";
     std::string tmp_video_dir = "/tmp/markup_video";
-    std::string debug_gt_tacks = "../markup_tool/data/test/MOT16-04/gt/gt.txt";
+    std::string tracks_path = "";
     std::string tmp_img_extention = ".png";
     size_t tmp_img_path_pad2length = 10;
     std::string tracks_filename = "tracks.txt";
@@ -26,11 +26,7 @@ struct PipelineRunParams {
 class MarkUp {
 public:
     bool get_frame(size_t frame_idx, std::vector<Detection>* detections) {
-        if (detections == nullptr) {
-            // TODO: Exceptions
-            std::cout << "No return container 'detections' provided!" << std::endl;
-            return false;
-        }
+        detections->clear();
 
         detections->clear();
 
@@ -97,7 +93,25 @@ class MarkUp {
         video_ = std::make_unique<Video>(params_.video_path);
     }
 
+    bool set_tracks(const std::string& filepath) {
+        if (filepath.empty()) {
+            return false;
+        }
+
+        if (!boost::filesystem::exists(filepath)) {
+            // TODO: Exceptions
+            std::cout << "File not found:" << filepath << std::endl;
+            return false;
+        }
+
+        if (params_.tracks_path == filepath) {
+            return true;
+        }
 
+        track_container_.reset(nullptr);
+
+        params_.tracks_path = filepath;
+    }
 
     bool run() {
         track_container_.reset(nullptr);
@@ -114,15 +128,21 @@ class MarkUp {
             return false;
         }
 
+        if (params_.tracks_path.empty()) {
+            // TODO: Exceptions
+            std::cout << "File with tracks are not choosen" << std::endl;
+            return false;
+        }
+
         // track_container_ = this->run_pipeline(*video_);
 
-        /* if (boost::filesystem::exists(params_.debug_gt_tacks)) {
+        /* if (boost::filesystem::exists(params_.tracks_path)) {
             // TODO: Exceptions
-            std::cout << "No debug tracks:" << params_.debug_gt_tacks << std::endl;
+            std::cout << "No debug tracks:" << params_.tracks_path << std::endl;
             return false;
         }*/
 
-        track_container_ = read_dummy_trackcontainer(params_.debug_gt_tacks);
+        track_container_ = read_dummy_trackcontainer(params_.tracks_path);
 
         return true;
     }
@@ -190,6 +210,18 @@ class MarkUp {
         return params_;
     }
 
+    size_t get_video_len() const {
+        if (video_ == nullptr) {
+            return 0;
+        } else {
+            return video_->size();
+        }
+    }
+
+    PipelineRunParams get_params() const {
+        return params_;
+    }
+
 private:
     PipelineRunParams params_;
     std::unique_ptr<Video> video_ = nullptr;
diff --git a/markup_backend/src/markup.cpp b/markup_backend/src/markup.cpp
index da96f98..2f72703 100644
--- a/markup_backend/src/markup.cpp
+++ b/markup_backend/src/markup.cpp
@@ -61,8 +61,6 @@ std::unique_ptr<TrackContainer> MarkUp::run_pipeline(const Video& video) {
 
     //
 
-    // std::unique_ptr<TrackContainer> track_container(new TrackContainer(tracks_filepath));
-
-    return std::make_unique<TrackContainer>(tracks_filepath);
+    std::unique_ptr<TrackContainer> track_container(new TrackContainer(tracks_filepath));
 }
 
diff --git a/markup_backend/test/test_markup.cpp b/markup_backend/test/test_markup.cpp
index 851cecb..c1e9f06 100644
--- a/markup_backend/test/test_markup.cpp
+++ b/markup_backend/test/test_markup.cpp
@@ -52,7 +52,8 @@ BOOST_AUTO_TEST_CASE(markup_logic)
 
     BOOST_CHECK(mark_up->run());
     for (size_t frame_idx = 0; frame_idx < mark_up->get_video_len(); ++frame_idx) {
-        BOOST_CHECK(mark_up->get_frame(frame_idx, &detections));
+        BOOST_CHECK(mark_up->get_frame(not_real_index, &detections));
+
         BOOST_CHECK(!detections.empty());
         for (const auto& det : detections) {
             BOOST_CHECK_EQUAL(det.frame, frame_idx);
diff --git a/markup_backend/test/test_utils.cpp b/markup_backend/test/test_utils.cpp
index f98628c..58d6f84 100644
--- a/markup_backend/test/test_utils.cpp
+++ b/markup_backend/test/test_utils.cpp
@@ -42,8 +42,7 @@ BOOST_AUTO_TEST_CASE(read_det_from_file)
 
     std::string det_filepath = "../../../markup_tool/data/test/MOT16-04/gt/gt.txt";
     std::string video_filepath = "../../../markup_tool/data/test/MOT16-04/img1";
-    // std::string det_filepath = "../markup_tool/data/test/MOT16-04/gt/gt.txt";
-    // std::string video_filepath = "../markup_tool/data/test/MOT16-04/img1";
+
     std::string debug_detections_dir = "/tmp/detections";
     cv::Size test_img_size(1920, 1080);
 
diff --git a/markup_frontend/include/markup_frontend/maincontrolpanel.h b/markup_frontend/include/markup_frontend/maincontrolpanel.h
index 877ebca..ed41ac8 100644
--- a/markup_frontend/include/markup_frontend/maincontrolpanel.h
+++ b/markup_frontend/include/markup_frontend/maincontrolpanel.h
@@ -13,7 +13,8 @@ class MainControlPanel : public QWidget
     explicit MainControlPanel(QWidget *parent = nullptr);
 
 signals:
-    void send_path(QDir dir);
+    void send_video_path(QDir dir);
+    void send_tracks_path(QString path);
     void send_run();
 
 private slots:
diff --git a/markup_frontend/include/markup_frontend/markupwidget.h b/markup_frontend/include/markup_frontend/markupwidget.h
index c7ad320..7a9cbd5 100644
--- a/markup_frontend/include/markup_frontend/markupwidget.h
+++ b/markup_frontend/include/markup_frontend/markupwidget.h
@@ -19,6 +19,7 @@ class MarkupWidget : public QWidget
 
 public slots:
     void slot_set_video_path(QDir path);
+    void slot_set_tracks_path(QString path);
     void slot_framechanged(FrameWithControl *fwc);
     void slot_run();
     void slot_delete_bbox(int track_id, int frameidx);
@@ -27,8 +28,8 @@ public slots:
 private:
     MainControlPanel *maincontrol = nullptr;
 
-    FrameWithControl *fwcup = nullptr;
-    FrameWithControl *fwcdn = nullptr;
+    FrameWithControl *upper_frame_panel = nullptr;
+    FrameWithControl *down_frame_panel = nullptr;
 
     // проверить возможность удаления...
     // QDir path;
diff --git a/markup_frontend/src/maincontrolpanel.cpp b/markup_frontend/src/maincontrolpanel.cpp
index 08dc528..a34e7f3 100644
--- a/markup_frontend/src/maincontrolpanel.cpp
+++ b/markup_frontend/src/maincontrolpanel.cpp
@@ -38,7 +38,7 @@ MainControlPanel::MainControlPanel(QWidget *parent) : QWidget(parent)
 void MainControlPanel::slot_loadvideo() {
     auto path = QFileDialog::getExistingDirectory(this, "Open Folder with frames");
     QDir dir(path);
-    emit send_path(dir);
+    emit send_video_path(dir);
     // call some backend-function
 }
 
@@ -51,7 +51,8 @@ void MainControlPanel::slot_loadmodel() {
 
 void MainControlPanel::slot_loadtracks() {
     auto path = QFileDialog::getOpenFileName(this, "Open Tracks", "",
-                                             "*.tracks");
+                                             "*.txt");
+    emit send_tracks_path(path);
     qDebug() << "tracks path : " << path;
     // call some backend-function
 }
diff --git a/markup_frontend/src/markupwidget.cpp b/markup_frontend/src/markupwidget.cpp
index a673817..6aff628 100644
--- a/markup_frontend/src/markupwidget.cpp
+++ b/markup_frontend/src/markupwidget.cpp
@@ -10,8 +10,8 @@ MarkupWidget::MarkupWidget(QWidget *parent)
         : QWidget(parent)
 {
     maincontrol = new MainControlPanel(this);
-    fwcup = new FrameWithControl(this);
-    fwcdn = new FrameWithControl(this);
+    upper_frame_panel = new FrameWithControl(this);
+    down_frame_panel = new FrameWithControl(this);
 
     QHBoxLayout *hlayout = new QHBoxLayout(this);
     QVBoxLayout* fwclayout = new QVBoxLayout;
@@ -19,12 +19,14 @@ MarkupWidget::MarkupWidget(QWidget *parent)
     hlayout->addWidget(maincontrol);
     hlayout->addLayout(fwclayout);
 
-    fwclayout->addWidget(fwcup);
-    fwclayout->addWidget(fwcdn);
+    fwclayout->addWidget(upper_frame_panel);
+    fwclayout->addWidget(down_frame_panel);
 
-    connect(maincontrol, &MainControlPanel::send_path, fwcup, &FrameWithControl::setPath);
-    connect(maincontrol, &MainControlPanel::send_path, fwcdn, &FrameWithControl::setPath);
-    connect(maincontrol, &MainControlPanel::send_path, this, &MarkupWidget::slot_set_video_path);
+    connect(maincontrol, &MainControlPanel::send_video_path, upper_frame_panel, &FrameWithControl::setPath);
+    connect(maincontrol, &MainControlPanel::send_video_path, down_frame_panel, &FrameWithControl::setPath);
+    connect(maincontrol, &MainControlPanel::send_video_path, this, &MarkupWidget::slot_set_video_path);
+
+    connect(maincontrol, &MainControlPanel::send_tracks_path, this, &MarkupWidget::slot_set_tracks_path);
 
     connect(maincontrol, &MainControlPanel::send_run, this, &MarkupWidget::slot_run);
 
@@ -37,12 +39,16 @@ MarkupWidget::MarkupWidget(QWidget *parent)
     connect(fwcdn, &FrameWithControl::send_delete_track, this, &MarkupWidget::slot_delete_track);
 }
 
-// тут нужно передавать путь в бекэнд... но сейчас некуда...
 void MarkupWidget::slot_set_video_path(QDir path) {
     markup.set_video(std::string(path.path().toUtf8().constData()));
     path = path;
 }
 
+void MarkupWidget::slot_set_tracks_path(QString path) {
+    markup.set_tracks(std::string(path.toUtf8().constData()));
+    path = path;
+}
+
 void MarkupWidget::slot_run() {
     qDebug() << "Rewrite using new MarkUp interface";
     markup.run();