After some quick research I found this.
Motion Blur
Using Blur Instance, Using DepthOfField > More Info
Frame Blending/Ghosting?
Ok so ask we can see from this response, Ghosting works by taking a frame and then fading it out to create a slowed motion blur effect.
Im not too sure of how we can achieve this in roblox, BUT MAYBE, if we use a viewport frame and a world model with some properties to replicate the lighting and scene we can maybe achieve this.
