Start the camera to begin watching for movement.
Everything runs locally in this page — no frame ever leaves your device.
This detects movement in the frame using live pixel differencing, then checks whether the
moving area is roughly upright and person-proportioned (taller than wide) before capturing — it's a
lightweight shape heuristic, not true AI object recognition, so pets, cars, or waving branches can still
occasionally trigger it. Turn off "Favor person-shaped motion" to catch any movement at all.