The Tracking tool supports the display of the speed at tracked point.
Right click the path tracked and use the menu Configuration. Then select Speed in the Measurement options.

The speed indication is the average speed of the segment between the previous and the current point.

You can specify your preferred speed unit from the Preferences dialog.

Note: By default the speed unit is Pixel per frame (px/f).
For the speed to be expressed in real world units, you must first add a line and set its real length as described in Measuring distances.

See also:

• Tracking objects or body joints
• Measuring distances
• Measuring time