POE has nothing to do with NVRs. They are mutually exclusive technologies. I have many POE devices that are not cameras, and many cameras which are not POE.
That said, I’m using Blue Iris and Deepstack. I’ve had a few bumps along the way with various versions of both HA and Blue Iris, but at the present moment, both are working quite well together. Using deepstack for object recognition, I have it configured so that if any of my exterior cameras detect a person after sunset, HA turns on all my floodlights. Works great!
The only requirements of a camera to use it with an NVR is that it provides an RTSP stream. There’s lots of noise made about ONVIF as well, but I really don’t understand all the nuances and won’t pretend to.
That said, the post above about “continuous data streams over 2.4ghz wifi is a terrible idea”… That’s simply false - at least, not without several qualifiers. I mean, if you’ve got some cheap, consumer-grade wifi that uses mesh extenders (think NetGear, Linksys, etc), then sure - you’re probably going to have a really hard time.
If you have a bit better network - something with a WLAN controller and multiple APs that are all wired, it’s not an issue. I’m using Ubiquiti with half a dozen wired APs to cover my house and yard, and have 8 2.4GHZ wifi Ubiquiti cameras at present, and will likely add more. I also have 4 POE cameras (Amcrest). Everything works great.
To give you an idea as to utilization, in the previous rolling 24-hour period my wifi cameras have generated the following amount of traffic:
41GB 24GB 42GB 26GB 37GB 23GB 26GB 25GB.
For even the busiest camera, the math says that’s only 500KB/s. Again - depending on your network equipment, number of radios, and some other variables, this is not anything to remotely be concerned about.
Not saying it “will work” for everyone, but the point is that it CAN work. As always, YMMV.
ETA: I run Blue Iris, Deepstack, and Plex all on a single Intel NUC with 16GB RAM. Works great. I added a 2TB drive to it for immediate storage, and have it offloading to a NAS for longer-term storage.