video cam problem

Hi
   I want to but video cam which have build-in motor. But i can't find
one that provide the programming interface, you know anyone does?
   Also, i want to use programming to control the zoom level, but
almost video cam doesn't provide a good zoom-level, less than 3x
optical zoom.  I think i should but a normal video cam, but how can i
control the S-video  signal to data through parallel port or com-port?
what hardware i should buy and how much?

thanks
from Peter (cmk128@hotmail.com)