I'm not too sure of many Wicca exclusive YouTubers but I do know of some Pagan Youtubers that talk about a variety of witchy topics.
Ember HoneyRaven [the big fat witch] is one of my favourites but she's not Wiccan but I recommend her too.
TipToeChick isn't around anymore but her videos are worth a watch.
Kelly-Ann Maddox is a tarot reader and spiritual counsellor I love watching.
Others I've seen a few videos from include TieDyeWitch, TheNewWitch, The Sea Priestess, and Avalons Spiritual Odyssey. You can always go to the person's YouTube page and click on 'channels' there's usually a list of other YouTubers they recommend.