The video shows motion trajectory being followed (shown in red color) by autonomous vehicle / robot once a path has been planned (shown in green color) by the system. The objective is to make the vehicle follow the planned path as accurately as possible.
Vehicle tries to match both its spatial location as well as the orientation. Initial location of the vehicle as been intentionally given offset in this video to demonstrate how the vehicle gradually rectifies itself.
On the left is the simulator, showing an autonomous vehicle as it moves along a certain path. On the right is the visualizer, where planned path (green color) and actual path followed (red color) by robot have been shown.