Back button response in video call

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I am building an android application having video call facilities. I have used pristine.io webrtc library. My problem is when I press back button I want to finish the activity and show a small video view in top right corner of the screen. Thus user can navigate other activities of the application. If a user touches the small video view, the original Activity restarts with full screen video. Can anyone help me telling how can I do this.

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