I don’t know if what I want to do here is possible :
In After Effect we can create adjustement layers that only add the wanted effect to what is behind them, for exemple I can add a blur effect to this layer and so blur the parts of my video I want easily and dynamically this way.
I would need the exact same thing in Blender, ideally a material on a plane that would be invisible but would “blur” everything that is behind it, so I can place it where my scene is too sharp and smooth it.
I hope i’m clear with what I am asking, ideally I need it working in Eevee. Thanks if you have any idea!