The price of the standalone camera is $100, which is appropriate and cheaper than Kinect and TrackIR.

Also, some newer laptops comes with integrated camera.

I saw in SDK that https://software.intel.com/sites/default/files/Face_Tracking.pdf
camera supports face orientation (in degrees) of a face once it is
detected. Face orientation is measured three ways as: roll, pitch, and yaw.
I think that it will be great if Arma could support this camera out of the box.