Black Ops 7: Call of Duty battles to stay on top

Tom Richardson,BBC Newsbeat and Mel Ramsay,BBC NewsActivisionActress Kiernan Shipka takes a central role in Black Ops 7's campaignThere are some things you can always rely on, and a new Call of Duty game coming out each year is one of them.As one of the best-known names in video games, it's a series that needs little introduction.According to publisher Activision, it's sold an estimated 500 million copies, a…