I'd say that we have quite a lot of questions asking for videos of lectures about some particular topic or area. Just try to search for video on the main.
I think that such question could be tagged online-resources.1 Would it be useful to introduce a more specialized videos tag?
There are also questions about documentaries and movies about mathematics. (Try searching for documentary or movie to see a few examples. If we create this tag, such questions could also belong there.
1 Admittedly, videos need not be necessarily watched online. But the same is true about most of other online resources; they can be downloaded and accessed offline. But main reason for choosing this tag is that it is the closest tag to videos that I know of.