My setup is:
DHI-NVR4104HS-P-4KS2 NVR
Some IPC-HDBW2431R-ZS cameras attached to the NVR.
I am using the Chrome app, as this is the only plugin which provides me with actual images.
First, I tried to setup IVS rules using the NVR web GUI, which seemed to work OK but the rules tend to disappear...