Cool video. That's one of the nicer things about sailing in the Gulf of Mexico. I don't know that I have ever been sailing here, and not had dolphins come swim along beside us, often several times on one trip.
We once had several dozen come up near us and start mating, but in all my years, I only saw that happen one time. I looked over and told my wife, "Why are the dolphins fighting?" And, then it hit me what they were doing.