Ok, i got some information
In the special feature of the <HEROES>SEASON 1
the se supervisor shows the scene which Hiro frozen
the time to save the little Japanese girl
every thing was frozen but Hiro
because everyone in the street were just "freezing"
by them self. And some guy ride on a bike was just
Fixed by some green stuff...for keying in the post-production
So, the cameraman just take the steadicam and follow
Hiro for the shoot, just like a "freezing world"
And the stuff float in the air was made by CGI
so my advise for low-budget student film which want
to get this effects... keep breathing and don't move