fastest way to test streams:
ffmpeg -i rtsp://<user>:<pass>@<ipaddress>:554/path ./output.mp4 (if terminal only) ffplay rtsp://<user>:<pass>@<ipaddress>:554/path (gui)
find paths on ispydb or in zm hcl
If you are new to security software, read:
https://wiki.zoneminder.com/Dummies_Guide