You can't change the mindset, but you can change the process. In India, there are female only cabs/booths in trains. Female only buses should be run during peak time, if not by private entity then by government.

Edit: Camera won't be useful. How many cameras and how many angles are you going to shoot it from? These things happen in a crowded bus, a camera cannot capture all angles, and these pervs use the every nook and cranny possible to get their hands around. Also the review process would be significant burden.