What is an approach in computer vision that can be used for tracking players in hockey games?
Regarding speed and occlusions, I would suggest you to take a look at this work on basketball: Locate and Track People in a Network of Fixed Overlapping Cameras, and notably published in A. Alahi, Y. Boursier, L. Jacques, and P. Vandergheynst. Sparsity Driven People Localization with a Heterogeneous Network of Cameras, in Journal of Mathematical Imaging and Vision, 2011. Then by looking at its citation network, you could find other relevant work.