Creating an overlay blur effect in 2D - Please Help!

Hi,

I am attempting to create a blur effect to cover the background of my scene in order to add an air of depth. I have five layers of background that has a parallax effect applied to them, I would like a layer of blur in front of the last three layers of background, so far I have attempted every Shader Graph tutorial only to find out they will not work in 2D.

I have also tried creating two cameras, overlaying one and applying post processing depth of view to the base only to not have post processing work at all.

Any ideas how I can create the effect I am looking for?

Oh I really want it too, did you found a solution?