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There are many Pan/Tilt/Zoom (PTZ) cameras on the market currently, which are ostensibly focused on surveillance and are usually IP-based. However, there are many (often robotics-oriented) projects out there that create their own pan (and sometimes tilt) mounts with servos and/or stepper motors.
Some examples include;
http://mitchtech.net/raspberry-pi-servo-face-tracker/
http://www.instructables.com/id/Face-detection-and-tracking-with-Arduino-and-OpenC/
http://blog.oscarliang.net/raspberry-pi-face-recognition-opencv/
One of the most interesting ones, however, is a balancing 2 wheel robot that follows a ball around a room (could just as easily be a face);
https://www.youtube.com/watch?v=3BJFxnap0AI