Padel video analyze project that I'm working on

I realize, that now once a month someones shares this kind of project, but still wanted to share :) I wanted to make it work on regular club footage, have it working on 3 courts now. It's mostly general by now, but still requires manual calibration (10 points) on each court, or if camera have moved. It's my first time dabling with CV, so just playing around. All of it is vibecoded, but with my direction, which is sometimes limited, because.. well, no experience with CV. I have over 10 years of dev experience in other fields, so that helps a lot. This is an excerpt of my marking/diagnostics app