Accessing VelocityBuffer via PostProcess Material

Hi all - I am trying to write somewhat of a custom motion blur script and require per-pixel velocity vectors.

Is there any way to access the camera motion blur and object motion blur via the VelocityBuffer as in https://api.unrealengine.com/udk/Three/MotionBlur.html?

Essentially all I want is to access the output from

show VisualizeMotionBlur

via a material.

Did you ever figure out how to do this? I’m also interested in this.