Correct, NVR's will cease to display video via plugins also..
IE (not edge) and Safari are the only 2 browsers still standing with NPAPI Plugin support.. RTSP is the long standing standard for video surveillance, however HTML5 has no support for this protocol and decent realtime video streaming has not achieved any level of agreement between the browsers or standards bodies.. thanks largely to patent encumbered video technologies.
Basically pluginless Video Surveillance in the Browser is still along ways away.. dont hold your breath for this functionality to appear soon.
Us in the IT world been dealing with this crap for a long time; we keep isolated VM's or machines around with antique web browsers to maintain the capabilities to interface with existing software thats never going to see a update to support modern browsers.. get used to it, this is what happens all the time w/embedded hardware, and its getting worse now that they are putting this shit into our cars and stuff, imagine how useful your CarPlay enabled car will be in 10 years when nothing talks to it anymore.