I have no doubt that there is a video involving hrc and a child. But I don't think this is the video that may hit soon. Would have to be heavily edited, otherwise it is child porn which for obvious reasons cant be spread around the interwebz. If edited it would just give credence to potential fake.
To be believed 100%, it cant be edited. So more likely the video will show a business meeting w/hrc and black hats either selling state secrets or involved in a child trafficking deal.