It turns out to be a charming, very amusing video. It takes place during an exhibition doubles match, and at one point, Ms. Wozniacki walks over to the referee's chair and wants to switch places, handing him her racquet. And once she takes control of the match, she begins to call all the points against her opponents for any number of violations. Which brings about the "confrontation" in question.
All of which goes to confirm Caroline Wozniacki's reputation friendly and funny.