*qbittorrent

https://www.amazon.com/Livestock-Scratcher-Grooming-Scratchers-Livestocks/dp/B0CYCNCCTS

I also found this, It’s for a RaspberryPi but surely can be adapted:

https://gist.github.com/seffs/2395ca640d6d8d8228a19a9995418211

You can look at the source of the snap and check what it does

I don’t have any experience with your exact question.

But I would look into xinit and try if you can start just mpv.

If this doesn’t work look for a slim WM and configer it that the applications are displayed in fullscreen and launch mpv after the WM.

Probably any of the tiling window managers should work: https://wiki.archlinux.org/title/Window_manager