The time freeze effect in the video you linked to is pretty simple. What they did was lock the camera down on a tripod and shoot the kids skateboarding then have those kids move out of the shot and shoot the singer coming up to the glass. You then put the kids on V2, the singer on V1 and use a matte to 'cut a hole' in the footage on V2 so that the singer on V1 shows through. If you watch carefully you'll see the kid in the white shirt's reflection disappear from the glass when they get 'frozen'.
Other types of "time freezes" where people interact w/the environment and/or move around 'frozen' people/objects are more complicated to pull off.
Lethal