In case you were looking for an excuse to buy a second DSLR that does video, you can check out this HDR video accomplished using dual 5D Mark IIs. I'm not a fan of overdone HDR, and overdone HDR in video is just as bad. This isn't overdone per-se, but it could be easily abused. That said, if trends go as trends go, I see this being a built in feature to DSLRs in 5 years....