Resume tracking when feature is found again

[ZestyRaraferu]

Is your feature request related to a problem? Please describe.

There's two situations I found quite frustrating:

1. The tracked feature gets obstructed for a brief second before turning visible again, usually by the actor's hands. The scene would otherwise be seamless and perfectly trackable... But the tracking process gets terminated and the user need to start another.

2. Imagine a video where the male feature is just on the border of the camera. Whenever he pushes, it enters the view. Whenever he pulls, it leaves the view. The tool would not work with this kind of video because there wouldn't be a tracking time long enough.

I'm imagine a solution where...

If the feature is lost, pause tracking but keep playing the video. Resumes tracking as soon as the feature is found again. Assume there's no movement in between.