Here is a picture of my Dads TP-Link KC401. I borrowed it to prove my point. It requires a Kasa home account. I tried signing up for one to see if it has any sort of RTSP I could hook up to, unfortunately I can’t even sign up for an account. I tried first with a temporary email, then my own domain, then I tried protonmail. It rejected all three. Doesnt seem very privacy friendly to me at all if I need an email provider like Google to even sign up to use the damn thing. I can’t find any sort of documentation online about these cameras having RTSP. In fact what I found was the opposite..

The github page you linked there, while being a great option for people who have already drank the koolaid, is not an ideal solution in any capacity. Per the readme.md

If your camera still works with integration: Block internet access of camera if you are using firmware build 230921 and higher

If your camera no longer works with integration: Block internet access and factory reset camera or Use older firmware than build 230921 and optionally factory reset camera

Meaning, they updated it to prevent you from using it. To use it now you have to hack your way around it and pray it doesn’t accidentally come back online. IP Cam =/= Internet Connected cam. IP Cam means I own the camera, and it doesnt have to phone home to the manufacturer for “updates” that take away functionality.