Just to clarify, that video was not produced by the LDS Church and contains a huge number of inaccuracies. I won't get into it, because historically those types of threads turn into a giant mess. A quick search of these boards would provide many good examples.
I did think the part about God coming down to impregnant Mary was a pretty comical theatrical invention though. Like it was "Knock, Knock, Yo Mary, I am here for that booty call!"
Reminded me of this:
