The GoPro is a video camera device that can record a decent amount of footage in HD, depending on the device you use. As technology have progressed over the years, things have gotten more compact each year, allowing for an exponential boost in performance. We can now fit terabytes of information in something that could have only had the capacity of a few megabytes many years ago.
Another aspect of the gopro is that it is hands free, making it ideal for recording physical activity under a first person perspective. It is essentially a body cam. With this property, comes footage that we usually do not get to see, such as first person footage of individuals participating in firefights.