First off what is he doing out of his car in the first place? He is stopping the guy for a freakin’ seat belt violation, so what is he doing out of the car and why is the cop asking him for his license while he is out of the car? What the hell, who trained this idiot? Just wonderful, now the race baiters will be playing this non-stop for the next 100 years.
Generally that's what you do when you pull into a gas station.
I’d read that the guy was at a convenience store/gas station, not a traffic stop, and was getting out of his car to go into the store.
That particular video has been cropped and edited. If you look at the YouTube or PINAC version, it appears the man had pulled into the C Store & gotten out before or as the officer pulls into the parking lot.
You can't say with certainty but it also appears that the officer came out of his car with his pistol drawn. Either that or he is very fast on the draw.
Before you get on your soapbox, why don't you RTFA?