Handle picture in picture mode recording

[flowac]

1. Check what happens when the video is automatically switched to picture in picture
2. Handle switch in video modes

[flowac]

There might not be a clean way to handle switch to picture to picture. Might have to ask the user to pick a new window when face is no longer detected in the previous recorded window. The picture in picture window can already be recorded by the app but the size might make it hard to do eye tracking.

[flowac]

Brute force each window and determine if face detected. Some apps container video preview for yourself so we need to selected the largest window with face detected.