Uncle Drew is an old man who still knows how to play ball. He goes to public basketball-courts and surprises everyone showing off his skills! What the people in the video don't know, though, is that the old man is NBA player Kyrie Irving. He currently plays for the Cleveland Cavaliers along with LeBron James and Kevin Love!
There are 5 chapters in the Uncle Drew series. They are mainly advertisings for Pepsi Max. In some chapters, other famous basketball players are featured, but Kyrie is the most important (in my perspective, at least).
Just think of how amazing it'd be if something like that happened before your eyes!