Merge pull request #18838 from alalek:video_tracking_api

Tracking API: move to video/tracking.hpp

* video(tracking): moved code from opencv_contrib/tracking module

- Tracker API
- MIL, GOTURN trackers
- applied clang-format

* video(tracking): cleanup unused code

* samples: add tracker.py sample

* video(tracking): avoid div by zero

* static analyzer

modules/video/misc/python/pyopencv_video.hpp

@@ -0,0 +1,4 @@
+#ifdef HAVE_OPENCV_VIDEO
+typedef TrackerMIL::Params TrackerMIL_Params;
+typedef TrackerGOTURN::Params TrackerGOTURN_Params;
+#endif

modules/video/misc/python/test/test_tracking.py

@@ -0,0 +1,19 @@
+#!/usr/bin/env python
+import os
+import numpy as np
+import cv2 as cv
+
+from tests_common import NewOpenCVTests, unittest
+
+class tracking_test(NewOpenCVTests):
+
+    def test_createTracker(self):
+        t = cv.TrackerMIL_create()
+        try:
+            t = cv.TrackerGOTURN_create()
+        except cv.error as e:
+            pass  # may fail due to missing DL model files
+
+
+if __name__ == '__main__':
+    NewOpenCVTests.bootstrap()