Fuse(merge) 2 sprites as they approach each other (unity 2d)

Hi i seen this video by Sebastian Lague on ray marching. Link: https://www.youtube.com/watch?v=Cp5WWtMoeKg&t=204s At 3:19 mins.

How the effect look in 3D

I want this merging effect but for 2d sprites. Please can someone instruct me on how it can be made or the steps to make it.