videotape

Once again, I have a question for the JREF film and video wizards. How did they shoot this videotape? http://www.deaftv.com/film/Catty-Cake/ Viral Signs takes a video that has gone viral on youtube. com and interprets it in American Sign Language (ASL). Here's the original youtube video...

Is this the way to cut back on the aggressive youth fad of filming violent confrontations (that they usually instigate)? I would think that the laws against assault (assuming they have those in France) would be enough, but apparently this law will cover anyone filming a confrontation of any...