ultralytics 8.0.91 tracker fix and docs comments (#2343)

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>
Co-authored-by: Laughing <61612323+Laughing-q@users.noreply.github.com>

tests/test_python.py

@@ -236,3 +236,13 @@ def test_result():
     res[0].plot()
     res[0] = res[0].cpu().numpy()
     print(res[0].path)
+
+
+def test_track():
+    im = cv2.imread(str(SOURCE))
+    model = YOLO(MODEL)
+    seg_model = YOLO('yolov8n-seg.pt')
+    pose_model = YOLO('yolov8n-pose.pt')
+    model.track(source=im)
+    seg_model.track(source=im)
+    pose_model.track(source=im)