In Virginia, where I live, open carry law is in effect and I can say that I have never seen anyone carrying. I have been around firearms all my life, both for hunting and target shooting. Still, carrying a firearm would make me nervous.
In the military, I was a Military Police Investigator and was plainclothes. It was optional for us in my job as to carry a weapon or not. I chose not to except on rare occasions. I was always self conscious about carrying a gun under my coat in a shoulder holster. That probably sounds strange since I was a cop, I guess if I carried every day I would have gotten used to it. In uniform, I carried a .45 in a shoulder holster visibly. You were not allowed a .45 concealed. We had .38 for that.
I can understand the cop in the video having a fit, it is a dangerous world and walking up to a car at night is nerve racking because you never know what to expect. The problem was, he never gave the driver an opportunity to speak, and then had a meltdown. He is obviously wired a bit to tight to be a law enforcement officer. Good thing they suspended him. I noticed his partner managed to keep his cool. Also, the guy in the car was obviously intimidated by the cop which didn't help the situation.
As far as getting stopped, ALWAYS keep your hands visible, either on the wheel or out the window resting on the door. Everyone will stay safer that way, and believe me, the officers will appreciate it, although I doubt they will say so.