HD footage can never be burned to a DVD directly (at least not for the purposes of playback on a normal DVD player), as DVD is fundamentally NOT HD. To burn something playable by a DVD player requires recompressing the video from MPEG-4 AVC to DVD-compliant MPEG-2.
It is pretty easy to burn HD footage to a Blu-Ray as the AVCHD standard is effectively a subset of the Blu-Ray video standard. It is also possible to burn a Blu-Ray file structure to a DVD, in which case normal DVD players can't use it but Blu-Ray players will treat it as a "small" Blu-Ray disc with limited play time.
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