I haven't seen any videos of the sort, but in October last year there was a car crash outside my house. I raced round to where it had happened (I have had some basic first aid training, so I went to see if I could help). 2 occupants in one of the cars weren't wearing seatbelts.
I went round to find a girl hanging out of the passenger window with blood pouring from her face, but still concious. The man (who was the driver), was sprawled across the dash, unconscious and bearly breathing. He had blood coming out of his nose. We kept talking to him in case he could hear. Anyway, the po;lice and paramedics arrived, and decided they had to get him out quickly. I helped by holind his head as still as I could while they got him out of the drivers side door. Blood from his ear fell out onto my hands, and I could feel bones moving (his jaw I think) as he was moved.
Anyway, they were doing trying to get his heart going, I offered my help and was "breathing" for him by using the bag+tube in his mouth, but sadly he died.
Naturally I didn't sleep very well that night. It turned out his name was David and only 26. Younger than me, and his life extinguished by not wearing a seatbelt.
Anyone who reads this and regularly drives without a seatbelt please PLEASE think again, as it the accident was caused by the other driver.