There are hundreds, maybe thousands, of mtb DVDs you can find by just Googling. Most are focused on racing and stunts. Some are skills lessons. I bet your local bike shop has a few you can borrow.
http://westcoaststyle.net/
Maybe there are some that are trip-based, but I've never seen one. Frankly, most videos taken from the handlebar or helmet of a mountainbike can be pretty darn boring as the rider can't look up and around or scan the scenery. It's all staring right at the trail and lower speed than a road bike video.
Frends know gud humors when dey is hear it. ~ Da Crockydiles of ZZE.