The guys over at Soviet Montage have created a video getting a lot of buzz in the last day or so. Regardless if this is the first true HDR video or not, it's most definitely the first of its kind coming off a Canon 5D MKII. Check out this short video they created with two DSLRs (one over exposed and the other underexposed); it's definitely an interesting look. I've never been a huge fan of the HDR look but I'll admit it does look pretty cool in video form, especially with people.
Could This Be The First HDR Video?