I have came across this thread, which is unfortunately closed :
Since i’m on linux, none of the solution works and I think a more universal solution would be to use OBS studio and it’s virtual webcam feature.
Media as an input, so you can use an RTSP feed and → Virtual webcam as the output.
I didn’t want to start a new thread only for this but I don’t think there is a way to reopen an old thread ( 1st day on this forum actually ).