The original poster wasn't suggesting taking two different exposures (like you do to make an HDR image in the traditional sense), but just using the data from the RAW image, pushed to high and low values, to create a composition that is more than the sum of its parts. I've done this before with DSLR RAW images before as well, and it does work. I agree with im.thatoneguy, though - I think the camera will give us plenty of latitude to begin with and you're not going to want to be bringing on the headache of trying to HDR every frame in post.glenn chan said:The dual exposure idea (for video) has been discussed over at dvinfo.net.
http://www.dvinfo.net/conf/showthread.php?t=78155
For video, the motion is not a trivial problem. In particular, see Greg Lowry's posts.
Certainly for stills, multiple exposure to give a HDRi image makes sense.