I use frigate on docker on LXC on PVE. I have a 10-year old Xeon with Intel iGPU that I pass through to frigate as a detector, and it handles object recognition with an inference speed of around 9ms across my 3 cameras, which is much better than when I used 3 CPU cores as detectors. I also pass the same iGPU to jellyfin for transcoding, and it handles both jobs concurrently without too much fuss (but it does get loud!) Worth considering anything 8th gen Intel or newer with iGPU will do fine with a small number of cameras.