add Blur to Secondary (Digital Makeup)

Hi,
I would like to blur or defocus a face of a 4K shot. The normal way to do it would have been to select a color in a secendary and blur it a bit but I can't seem tu find how. Any clue?

You have to go into the color FX room.

Build a node tree with a HSL key and blur. Feed the blur into the HSL key and then combine that to an Add node and use the alpha. It will soften your skintones...

Thanks, it worked fine! It should be a "must know" trick when working with Color. First reel job with Color and I will definitly try to do more.