Notes
Setup and configuration
Premult Roto to isolate alpha.
Smart Vector
Modify Vector Detail and Strength as applicable.
Link Smart Vector to Vector Distort.
Vector Distort
Define Reference Frame to track in Vector Distort with Set to Current Frame.
Enable Frame Hold on defined Roto.
Source: https://www.youtube.com/watch?v=snPA3aKdBJs&ab_channel=Foundry%2Cimaginationengineered
Doc: https://learn.foundry.com/nuke/content/reference_guide/time_nodes/smartvector.html