That's exactly what we have today in this teaser trailer for a film called This Is My Winter, which follows climber and snowboarder Xavier de Le Rue, who scales some impressive mountains, then proceeds to snowboard back down them. Much of the footage here is caught by his helmet cam, which makes it all the more scarier, but the wide shots really give you a sense of the scale of these mountains, and just how vertical they are. At times it is just crazy-scary.
Thanks to The Goat for sharing this one.