This might get you started…
http://www.trossenrobotics.com/p/RoboTurret-Vision-Tracking-Starter-Kit.aspx
Also, It looks like it would work with Arduino.
This might get you started…
http://www.trossenrobotics.com/p/RoboTurret-Vision-Tracking-Starter-Kit.aspx
Also, It looks like it would work with Arduino.