The way the video was shot represents a significant shift in the way action sports have been captured in the past year or two. I wrote earlier about GoPro and how quality video can be shot by much smaller, more maneuverable cameras. This, in conjunction with the rise of commercially available drones, has really opened the door for new unique aerial perspectives.
The little drones have many key advantages over using a helicopter to accomplish the same goals. Namely, of course, is price. Renting a helicopter would cost many thousands of dollars per hour, whereas, beyond the initial purchase, the drove is relatively inexpensive and can be transported much more easily. Furthermore, as far as capturing the action, it is substantially more maneuverable, can fly into tighter spaces and doesn't drown everything in the near vicinity with debilitating rotor wash (notice that the water remains crystal clear as it flys overhead).
To continue this point, check out this outrageously entertaining angle of a fireworks display. It serves as a perfect example of what is capable when you take out the risk of injury and drastically lower the investment in equipment.