The point-of-view video shows a driver taking out a long-wheelbase M760i — the only version available in the U.S. — out on a stretch of Autobahn. This car is apparently equipped with the M Driver's Package, something not available in the U.S. That option raises the top speed from 155 mph to 190 mph, or 305 kph. It's interesting then that the speedometer in the video shows the car hitting 320 kmh, or 199 mph.
It's unclear whether that's a false number or if BMW's top-speed rating is slightly conservative. Lots of automakers misreport horsepower ratings, so it wouldn't be that much of a stretch for BMW to undersell the car's capabilities. Either way, it's a hugely impressive number. Just as impressive is the composure the car seems to have at those speeds. The driver apparently feels comfortable enough behind the wheel to keep at it for a while.