Found 3 possible solutions:
free plugin: CamCapture This should work for those who need an easy way to capture images from the built-in iSight camera. It should also work for other camcorder sources that support QuickTime. There is an example project, but no documentation. FYI - site and example in French.
A commercial option that I could not try is QTKit from MonkeyBread Software. This option is not free, but documented and maintained, unlike the free option.
realcapture is a free, unsupported RB canvas. It uses ads to access the camera.
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