Re-creating the fun (and ease) of physically picking the DVD/BR case with Jellyfin?
This may far fetched, but I think all the pieces are there..
I think of a child not able to use a remote well, but wants to pick a movie to watch.. takes it in front of the camera and it recognizes it and commands jellyfin to play if in it's library (it should be..).
I see grocery scans, trading card scanners, so I think with feeding it the tvdb images it may work.
You might try NFC for this rather than a camera. A usb reader/writer is $30-50, the stickers are $0.30 each. You probably want a dvd shaped fixture to place the case into to make sure it always lines up for a 5 year old, but that will work way better than optical recognition at the expense of having to set up each nfc tag, but that's something that was going to have to happen anyway for recognizing a physical movie cover.