A mechanism that moves in the opposite direction of the applied force?
Simple bi-directional movement is alright, but something capable of vertical, horizontal and rotational movement would be preferable. If you push downwards, the camera moves upwards - that kind of thing. Even a material that is semi-flexible would work, as a rod to attach the camera to that would provide some sort of resistance, and a position to snap back to.
I'm not looking for the whole design, just a starting point if anyone has any ideas about something that already exists that sounds like what I'm saying.