There isn't really anywhere in particular now, we did used to have the bluelight gallery which you are old fartish enough to recall... I think there is a risk of self-incrimination with users posting videos of themselves using drugs, even if the video is aiming towards herm reduction.
We don't forbid it but do tend to discourage just using videos or pictures. As a discussion board, our bread and butter is words and ideas exchanged... though I am happy to get ideas from the community on this. Would you like to have a place to post videos or pics?