The driver who crashed the Toyota Camry into the gas station is a 69-year-old man who apparently went into a diabetic shock right before losing control of his car. See how the police officer drags his unconscious body out of the vehicle.
Know that he is alive and recovering, suffering only from minor injuries.
The owner of the video says he was driving his wife to the airport in Moscow when he reduced speed after seeing a 40km/h (25mph) sign on the road. Apparently, the driver behind him thought he was trying to teach him a lesson and didn't appreciate it. Naturally as it's in Russia, it turned into a road rage incident.
Btw, he didn't shoot his gun, he used it to hit the other guy in the face.