I have hikvision, they support local rtsp but you need internet explorer to set them up. I’m not kidding, not mistaking it for Edge, and bought new 2 years ago

Symfonium looks amazing except for the part where you need a google play account to use it. It literally has every feature I’ve been looking for.

The name cloud comes from depiction of “somewhere on the internet” in network diagrams. I don’t know what corporate environment you’re in but you’re using the term incorrectly.