The IMAQdx drivers support many camera types, including USB webcams. They are available here
http://www.ni.com/download/ni-vision...13.08/4147/en/
Install the drivers and additional icons will show up in the Vision and Motion palette. It may also be helpful to look at some of the examples or at team code such as from 2468. They used the laptop camera this year as a firing enable mechanism.
Greg McKaskle