video taken in forecourt of sunoco gas station on north 5th street in philadelphia shows five people , including two children , storming out of a minivan and attacking helpless 51-year-old .
one of the group takes out mace as the man is brought to the ground .
they then stamp on his head and continue punching him as he lies motionless that the youngster accused the man of jockeying with him while asking to fill motorist 's tanks for spare change .