How to show a trail in the shape of a mesh to create the effect of it moving really fast?

Hello! I am trying to recreate this effect where I render the previous frame behind the current one so as my character moves across the screen there is a trail of its movement in the shape of the mesh. I found the trail renderer but that is just a line from the center of my mesh where I was hoping to get the trail to be an opaque image of what the character was doing just seconds ago. How does one do this?

an example would be an effect like this:
(also please give this person a follow, they make amazing stuff :))

You can use Post Processing and there is a stuff called Motion Blur.