Obviously there will be spoilers for the games in the series, so if you really care about the story in the games up to now, don't watch this video. Its also mostly text, so if you are really into it, get ready to do some reading.
The video gives the story of everything leading up to the November release of Black Ops III. The video will give you over a century of story leading up to what many described as being a rather shameless copy of Deus Ex. Though if you never checked out the rather humorous response from Eidos, give it a look.
November 6th is the day to look for if you are waiting for more Call of Duty, until then you can see more from the game's home page.