ofxAddons
Fail-Safe ofVideoGrabber, provides fallback to a user specified movie if videoGrabber not available.
Forks
Forks pushed to more recently than armadillu/ofxFailSafeVideoGrabber itself, plus any admin-confirmed fork with commits of its own — worth checking if you're hitting issues with the original.
README
Simple OpenFrameworks Addon intended to be a fail-safe replacement for ofVideoGrabber. It will mostly wrap it, but if there's no camera available, a safety measure will be taken so you can still run the project. A backup movie file will be used (if provided by the user) if no videoGrabber is available, and as a last resort, if a movie file is not available either, an ofImage with pixel noise will be provided.