Yes, you have quite correctly observed that not every function in the ARToolKit API is documented. Many functions are used only internally to ARToolKit itself, and knowledge of these functions is not necessary to use ARToolKit.
CameraVideo is not documented, but it is also not necessary to have it documented, since it is an internal implementation detail. The methods which you list simply request that the CameraVideo instance underlying libARVideo calls ARViewController as each frame is fetched. The method called is:
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- (void) cameraVideoTookPicture:(id)sender userData:(void *)data