I have a fake GS2000 (see my other topic). Externally there is no way I can see to identify it's a fake. Except maybe it came in a white box and the driver CD just only has star decals on it, no 'driver' writing or anything.
The menus have orange highlights and a darkgrey background, same as the "fake orange" noted on the detailed FAQ on this site about the GS1000.
The time/speed readout look exactly the same as on your video (this is how it looks on a blue menu GS1000, GS8000 and GS9000 but not on a genuine GS2000 AFAIK, but don't quote me on this)
The firmware version of my fake GS2000 looks like a date, such as '201201010'. (your picture takes too long to load I can't see it yet)
The sound and image quality is very bad. Video is very grainy and sound is crackly.
I also filmed a scooter crash soon after I got a dashcam
but with a Carcam K6000. It's nowhere near as spectacular as yours ofcourse.
EDIT: Saw the picture. Your menu looks exactly the same as my fake GS2000, the firmware is not 'exactly' the same , but it's in the same style as mine.
The Youtube video looks kinda too blurry, but that I don't know if it looks like that on the source video or if it's due to Youtube converting it.