Mac: stream a video file as webcam to applications (similar to CamTwist)

I am trying to program a feature, similar to that of CamTwist, with 开发者_高级运维which a video file (on hard disk) can be broadcasted to other applications as video input.

However, I am not sure where to begin..googling did not help much either.

a little guidance could be useful. :)

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You've got the OSX tag set so I'm guessing you want to do this on a Mac. Take a look at Syphon it has a good shot at being what you're looking for.