I was pulled over in 2004 with my video camera on my tank. It was a spot check set up by Sussex Police, wasnt pulled over for an offence. The officer saw the camera and just said “nice day for it”
I now have a bullet camera, if I am going out for a “naughty” ride or on the track the bullet camera is wired under the front fairing (out of sight) and the actual video camera is put in a small givi tank bag, this seems like the best thing to do for your Nurburgring trip.
I bought the following tank camera mount from eBay and it’s fantastic for recording things like drag racing, it is so secure, much better than those suction mounted devices I’ve seen.