This is the same technology used to fix shaky footage (Mercalli) and retime footage (Twixtor). For RSMB Pro, the focus is purely on one thing: Adding blur where the camera or object moved.
Use splines to separate foreground and background. Compatibility revisionfx reelsmart motion blur pro 621 plug
Render a few seconds. If you see "boiling" artifacts (halos around moving edges), increase to 1.5. This is the same technology used to fix