depends on your router, but you would want to stick to onvif or rtsp and connect to the camera using some sort of tailscale. Don't fail for installing open source firmware, there is only thingino and openipc, both are hard to install if you are a beginner, even if people say it's easy for technical specialist, it's not

They're also limited to older hardware, newer 3K+ cameras aren't supporter. Different chip in use, I guess, or there manufacturers have learned to sign this firmware and burn in the keys.