Yeah, there was an animated movie (which Netflix of course labeled as an anime) called Nightmare of the Wolf. It was a prequel starring Vesemir and showcased the series of events leading to the pogrom of the witchers at Kaer Morhen. And of course, like everything Netflix does, it ignored the established canon from the books to do its own thing and made the witchers all complete and corrupt assholes who fully deserved their genocide. Because that is all men can be in Hissrich's mind.