YOLO is quick enough that you can just run it on a CPU, assuming you don’t want to run it at full resolution (no point) and full frame rate (ditto) for multiple streams. When you run it scaled down at a 2-3 fps you’ll get several streams per CPU core no problem. Energy use can be minimized by running a quick motion detection pass before, but that would obviously make the system miss things creeping through the frame pixel by pixel (very unlikely if you ask me)