Motion capture is now used extensively in film and game animation, but what can you actually do in Blender with the free mocap data currently available? This is a brief basic guide to how the mocap data is displayed in Blender and how it can be manipulated to modify character behaviour.  The action is illustrated by putting a body to the mocap data using simple shapes parented to the controlling empties, using the armature as a guide only. Applying the mocap data to your own characters is another topic.