After I watched the tutorial at Game Tools | Motion Vectors | SideFX ,
I thought it would be good to have one in Unity, so I have created a custom shader with Shader Forge based on the Klemen Lozar’s approach.
The unity custom shader and a some modified motion vector Rop in Houdini will be available sometime soon.
Frame Blending with Motion Vectors in UNITY from min on Vimeo.