Well, you will not get “super high quality” still frames from the HVX.
Theoretically you should be able to copy a 1080 frame to roughly 16×9 cm @ 300 dpi.
(Open file in QT, find frame, hit copy, paste into new photoshop document)
BUT
I wouldn’t say that you’d get more than half that size as a decent print, due to the color compression.
I have (and love) the HVX, but it isn’t a still camera…
But, you could do with some heavy post’ing compositing i in photoshop. In that case framegrabs will be ok.
Gunleik