Any data on the accuracy of the method?

[Jumabek]

How many percentage of the time it tracks people successfully?

[CrisSherban]

Hi Jumabek,
People tracking is based on IoU, you can check it in player_detection.py.
It works really well, but keep in mind that is very handcrafted.
The percentage of time it keeps correct tracking of the same person depends on the video/action that the model sees.