Check out the Youtube channel Two Minute Papers if you haven't already. He covers a lot of stuff like this, and much of it comes with Google Collab demo scripts ready to run. Of course they're often poorly tested/maintained, and may take work to finish out into a tool for your specific use case, but you do at least get to touch the actual code and see how it works.

Reply to self! In this thread the user `mkaic` linked to their own work/study at: https://nomoregreenscreen.com/ ... perfect "getting started" material.