I wouldn’t say it is impossible. You might find players that accept dvd-video on blu ray media, it just isn’t a requirement for them. The cheap players seem to have fewer restraints for some reason.
Going the other way, we’ve seen some players that will read HD material off of dvds with no problems, even in blu ray format. Many others won’t, unless the player specifically has support for AVCHD and you make the video in that format.
The media companies and the hardware makers don’t seem to like for us to mix and match media and formats.
Edit: By the way, copying and burning as data does not make your disk into a dvd-video. Even if the data you are burning are several dvd-videos. Did ImgBurn specifically say it was burning as dvd-video?