Currently, we are developing transformer based tracking systems that learn about social interaction as people walk in a crowd. This enables us to track a very large number of people within a crowd.
Older methods
Here are some old example work we have performed on the i-lids and our own equivalent datasets
Doorway Detection
Abandoned Baggage
Abandoned Baggage2
https://www.youtube.com/watch?v=AbHd7qJtCbc
Parked Vehicle Detection
Multi-camera Tracking