You're talking about driving physical servos that control the camera's position and optics? I don't know, that's awfully specialized... It would take some work by a dedicated programmer with a few servo-controlled webcams to design a good, general purpose interface.
There *is* motion support for a few webcams using private IOCTLs. Have you seen the VIDIOCPWCMPT ioctls on http://www.lavrsen.dk/twiki/bin/view/PWC/ApplicationProgr... ?
And here's an application that uses them (I think): http://www.fastpath.it/products/palantir/faq.html#7
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