Since you never do picture-in-picture, I assume i understand what you mean.
However, I don't think I found examples on youtube. For some searches, the closest I got was: https://www.youtube.com/watch?v=aFRI6YTAhvw and https://www.youtube.com/watch?v=YTpo9Tj-xQg
Can you post a youtube video of what you mean (even though I think I understand :D)? Thanks!