A few videos are useful and great to have, but they are not replacements for good written documentation. Often, I don't want to or cant watch a video but can read written documentation (or I can watch videos, but without sound..). For programming related documentation, I usually just close the browser tab if the documentation I find is only in video format - I often won't even bother trying. For programs, I don't do it as often, but I've done it enough times that it matters. Often I'd rather google for five minutes than watch a five minute documentation video. Other times, the video is too slow or too fast for my taste and I end up skipping most of it anyway.

Also, I can easily perform text search for something in written docs, but not in videos.

Bottom line: written documentation is a must have, video documentation is very nice to have, but IMHO should never be a replacement, but rather an added bonus.