Movable head without pulling wires

I'm working on a small form factor turret with a movable head.  The design has a camera (w/ raspberry pi) on a spherical mount that can rotate altitude and azimuth directions.  Unfortunately, since its a turret, it must be able to twist infinitely without getting its wires tangled.  Any ideas?  I've been thinking about a laser based system, but I seriously doubt that that is going to be able to transfer enough data to stream video.  Anyone have a simple suggestion that hopefully keeps everything hard-wired?  

Great! Thanks!

Great! Thanks!

My first thought was… Why

My first thought was… Why not just keep the turret separate? That is with it’s own power source and if it’s the Raspberry Pi that does the image processing then why not keep that in the turret too? Then all you’d need is some cheap wireless data link (e.g. bluetooth) between the turret and the rest of the robot (or whatever you plan on building)…