We could improve Hyperion UI to allow using rtsp stream as the source for the colors.
The idea here is to turn old phone (that usually has a good camera) into RTSP streaming camera. This way phone which is constantly connected power can serve as external camera for ambilight. Additional benefit is the WiFI that allows for more flexible setup.
This is already double, so it's just a matter of adding some configuration into hyperion to ease up this flow: