That's very unlucky, I'm just glad the rider survived.
It makes you wonder what the driver of the car was looking at. Because the dash cam clearly shows an approaching motorcycle. We experienced MB'ers know often even the ones who do see us don't realize how fast we're going and pull out in front of us.
If you look at the very first frame, you can see a silver car to the right of the screen. The silver car is turning into the side street. I think the driver who hit the rider, had a glance at the oncoming traffic, didn't see the bike, and then his focus changed to the silver car that was turning into the side street.
It was a rushed decision by the driver, he clearly should have waited until the silver car had fully turned down the side street and then checked the oncoming traffic again.
I don't assume in situations like this I was seen with a moving vehicle. I slow down and sound my horn to get the driver's attention. When I see them looking straight at me eye to eye; then stopping, at this point I speed back up.
Exactly this, treat every car like it's going to pull out in front of you. Focus your attention on the car and observe their behavior. Back off from the gas a little and just coast for a bit and cover your brakes. There will be a point in time at which you can make it safely past them. At this point, even if they were to suddenly pull out in front of you, they wouldn't have enough time to hit you.
It also appears the rider of the motorcycle saw the turning car but assumed it was going to stop; because it saw him. Two/three wheeled no compartment vehicles have to take defensive driving to a whole lot higher level.
By the looks of it, those streets are 60km/hr (37mph). If you look at the petrol station (gas station) camera, you can see the rider trying to steer clear of the car, but it was way too late at that stage.
Ride safe everyone!