I’ve gone through YouTube offerings and plucked out a few for your perusal. I heartily encourage anyone with an interest to do some searching or look at the “related videos” and get a real feel for what’s out there.
There are, at least to my mind, a surprising number of videos on YouTube relating to both hex-and-counter wargames and miniatures wargaming. The latter is perhaps not as surprising, as it’s a game genre that’s undergoing a decade-or-longer resurgence thanks to games such as Warhammer and Flames of War. Wargaming companies themselves have gotten into the act, and provided some videos showing what’s in the box and how it’s used. Some are reviews of specific games, which I think is a fantastic application of the video format for wargaming.