Remember when the yellow first-down line was the height of game-time badassery? Details here are scant, but this looks like a trip:
PetaPixel writes,
The system would require a number of high-resolution cameras mounted in various places around the stadium. Each camera is connected to a network and controlled by software. Afterward, the video viewpoints are fed into an image processing engine that turns it into high-resolution 3D spatial data.
[YouTube]