How to recognize moving objects in video?

Question

Pattern recognition

I want to try to digitize the movement of players on the football field to compile statistics.
I see the following tasks:
1. Recognize the players in the video
2. Calculate the position of the player in space.
3. Save information for later analysis.
What can be used?

Answer 1

https://www.pyimagesearch.com/2015/09/21/opencv-tr...

Answer 2

Google "video object tracking".
For me, this task is more of an exploratory nature than a practical one.