AVFoundationVideoGrabber and AVFoundationVideoPlayer should both be OF independent.
AVFoundationVideoGrabber currently is not, but it will be in the future.
currently we have those sort of check all throughout ofxiOS and it definitely needs to be merged into the one place.
ofxiOSExtras is probably the best place for it but currently its a mess and includes every other class in ofxiOS.
i think for now this solution is ok and in the future we can address the ofxiOSExtras issue.