A subset of Computer Vision, Human Action Recognition (HAR) of athletes is an active research arena in computer science, for the broadcasting and media industry as well as for coaching sports. In the wider sphere, it has applications in the military and security etc.
An overview of Human Action Recognition in sports based on Computer Vision
It will be interesting how Canon's have implemented this feature as they tease it in the marketing speak....
R&D labs in the leading camera companies have probably invested in priority research in this arena over the past few + years....this includes rich image libraries for training refined Deep learning algorithms on dedicated hardware etc