When I got my Prusa MK4 I bought an inexpensive Wyze camera to monitor prints. I had heard they supported RTSP so I would have been able to use any app that knows that protocol with the camera. But it turned out they dropped support for that which was always a pain in my side.
I heard good things about the Tapo C100 so I picked one up for $20 a couple days ago. Very happy with it. Nice video quality, easy set up and works great with RTSP.👍🏼👍🏼