From ChatGPT:
The feature you saw in the video is called "helmet tracking" or "helmet cam stabilization." It's a visual effect often used in sports broadcasts and replays, where the camera or video software tracks a specific object, such as a player's helmet, and keeps it stationary on the screen while the rest of the environment moves around. This effect helps viewers focus on the player's head movements, providing a more immersive or detailed analysis of the player's perspective or actions during play.