I've done that before. I'll try it again the next time I'm at the track. In the mean time, I might dig up the earlier video.
High def is nice. You can see the tach and all. Event he GTech display is fairly readable, at least the G-meters. Not the text.
Placing the bullet cam on the door gives a pretty good view, too. You can see when I miss my apexes by 6".