Motion Visualization is the realtime capture of motion visible through the Site Gateway.
You can toggle on the Motion Visualization by going to the Workforce tab and selecting Views or Cameras on the left pane. From here select any camera of your choice.
At the top left of the stream hover over the overlay pan symbol (image below) and turn on Motion Visualization
Motion is represented as a sliding scale from amber to red color based on the speed of the motion. With red being the largest.
Scenes with a lot of activity will bring light to the source of the Motion Detection Alert, simplifying video review.
You can view more information about Motion Detection in this Knowledge Base article.