For safety purposes, I've had the idea of placing some sort of camera with audio capabilities (hidden) by the front door with a screen somewhere in the house. I'd like to do this wireless if possible using the outside light fixture as a power source for the outside part. That way, when someone knocks on the door I can see who it is and talk to them to ask them what they want without actually opening the door. Is there a kit for this that can be purchased somewhere? Seems like this would be a nice safety feature to have.