I do not get this idea at all. How are you going to use a compass, which has to be parallel to the camera AND parallel to the earth to work? Users would want to be able to hold the camera up and pan it, at which point the compass stops working due to gravity. If you get past this though, you could just use a lens over the compass to distort it into something legible to the assumed long focal length of the facing camera.

Personally, I do not need any ARG software to make comments about the ground or my shoes and pants.