title: CSRT algorithm not updating target
body: <p>I am using OPENCV built-in tracker CSRT for object detection and tracking, I found it best for using but I have question here when the target gets out of frame it still have a bounding box at last position he tracked when target comes back to frame it doesn't track that. From OPENCV documentation I came to know that this is short term tracker but is there any way to know that target is now not in frame i used this command </p>
  
  <pre><code>success, boxes = multiTracker.update(frame)
  print("Success",success)
  </code></pre>
  
  <p>to know whether it generates false but it doesn't. I have to use this algorithm for real time tracking. Moreover I am not willing for advance ML libraries like Yolo or TF, so if anyone can help with it or with some better tracker.</p>