how do i make a opengl application which can play video coming through a digital camera into my pc ? these cameras r plugged into USB port,how do read the data from there and use it ?

If your in a windows enviroment I belive you can capture this input using the direct show part of direct x, I dont know how I just know you can(I think). Then with this data you just copy it to a texture for use in open gl, probably best with glCopySubImage2d();

Im trying to figure out the same thing. I want to add a ''window to the real world'' to a scene. If you get it working could you let me know how Il do the same (jobrady@tcd.ie)
Thanks,
Joe

If the camera is has a Twain-driver, you may find this helpful http://www.twain.org/download.htm

Thrust me, i know what i''m doing