Looping video clips in iBooks Author?

Brand new to iBooks Author... I need my video clips to be set to loop either by default, or to allow the user to set them to keep replaying. They are created specifically AS loops (somewhat like audio loops), and if I cannot have the user play/view them as loops, then I will have to create longer/bigger videos, PLUS, I will be only guessing at the optimal viewing length for the average viewer. I realize that the reader/viewer can just hit play again, but this still defeats the purpose of using loops. (these are sports instructions where the point is to watch something repeatedly to help "burn it in", and they were shot and edited specifically to have seamless loop capability).

I did not find any way to enable this, and there does not appear to be any sort of robust (or even weak) third-party iBooks Author widget market where I might find something like that. Willing to pay well for a few customizations, but do not even know where to look.