This work presents the current state-of-the-art in techniques for tracking a number of objects
moving in a coordinated and interacting fashion. Groups are structured objects
characterized with particular motion patterns. The group can be comprised of a small
number of interacting objects (eg pedestrians, sport players, convoy of cars) or of hundreds
or thousands of components such as crowds of people. The group object tracking is closely
linked with extended object tracking but at the same time has particular features which …