Augmented Reality

Hi.... I need a little help here.
I was wondering about programming aplications of augmented reality, but to do this I would have a webcam at least.
I wanna know if there's a way to use a video instead, in a way that video will work like a camera.
I don't know if a was clear in my explanation about my problem. What I want, shortening, is "convert" this video to a video stream as I would have with a webcam.
An idea would be to find a better forum than this for posting this question.
OpenCV
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