There’s already some existing suggestions to support zooming the picture so the actual video is utilizing the full screen estate, cropping any black bars / letterbox frames.
Please comment/vote in that thread in order to help us avoid distracting or cannibalizing votes. Unless I’m missing some unique aspect of your suggestion, I’ll close this thread.
There’s a similar suggestion focusing on an option for Plex to provide a cropped output to fit the screen estate if the screen itself is zoomed.
