Have you tried an auto-tracking dome camera?  Be careful if you do because once you get hooked on them, it is pretty difficult to keep you from getting more.  These cameras represent some of the highest quality electronics available today.

What is an “Auto-tracking Dome Camera?”  It’s a special type of PTZ (Pan-Tilt-Zoom) camera that can lock onto moving objects and follow them where ever they go (within line of sight to the camera).