As I understand it, if you are involved in an incident/accident then any personal GoPro footage is not covered by the hard-won regulations regarding FDM/CVR privacy and non-disclosure outside of safety-related investigations. This means that such footage can be used directly by police/prosecutors in a court of law.
I have thought about it (as an owner of a GoPro used for other things such as sailing, cycling etc) for 'interesting' approaches such as into FNC but I have not, and will not.