Video-processing AI can be very flexible in its demands.

Even if a camera supports 4k 60fps video, the 'edge AI' can downscale the input to 224x224 2fps and use a small network.

Often the 'edge AI' just needs to detect humans/cars/pets and trigger saving some footage to an SD card/turning on a light. It's not the end of the world if it misses some things or raises false alarms sometimes.

And if you buy a Reolink on Amazon expecting it to be able to recognise a face from 20 yards away, you'll be disappointed.