Counting people in the street

With Processing and computer vision, what would be the best way to count / follow people in the street ? Two applications : (1) By placing a camera above the street, I would be able to count how many people is using the street per hour (2) By placing a camera above a football / soccer field, I would be able to follow each player during the match.

The issue proposes two computer-vision applications in Processing: counting pedestrians from an overhead street camera and tracking soccer players. Start by separating the requirements of these applications and identifying what each would need; done would mean a concrete, feasible topic scope rather than a general recommendation.

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