This is the official US Open Of Surfing Snapchat Story that was uploaded live on the final day of the contest. This was shot by various people throughout the day.
If you're unfamilar with Snapchat, it's a mobile app that lets you take and post photos and 10 second video clips you shoot on your phone or tablet. These photos and videos are called snaps, they only last for 24hrs. You either send these to snapchat friends or post them to your Story. Snapchat Stories string Snaps together to create a narrative that also lasts for 24 hours.