Blending cropped image edges/ crop rectangle rotation

[PoisonedSlice]

Here is an answer to Part 1, which also allows for Part 2:

How do I add a shadow to Crop Circle?

Hey, I’m looking for an effect between 360: Equirectangular Mask and Crop: Circle. I’d like to have the edges of my video covered with a circle which is what Crop: Circle does but how do I make this circle shadowed? I don’t want these edges to be that sharp. Is it possible to add a little bit of blur to this circle? Thanks in advance!