Blender Camera Tracking

here's how to constrain the camera to an object.....it makes the rendering a lot easier......go into object mode--- select the cam, hold shift and selct the object, press control t, select old track, select your camera(only your camera) then press alt r and clear rotation.......now when you move ur cam, it'll stay focused on the object, you can still rotate the cam for a better framing.....so there it is ;D

http://stuffmatic.com/blam-blender-camera-calibration-toolkit/

https://github.com/stuffmatic/blam/wiki/User's-guide

https://vimeo.com/35421849