spotting them? we have more. reporter: what you are about to witness not only seems crazy, it s also a crime. base jumping. it s the extreme of the extreme. base is an acronym. basically find something tall and hurl your body off of it. the jumper in this video took flight off a gone doe la. police are using the video posted on social media sites to track down this jumper. they say they have already arrested a woman to allegedly helping him jump. youtube will become a vehicle to prosecute and find them.