Probably the first thing to start with would be a Channel Blur. You may have to tweak the blur individually for separate shots.
Once you’re happy with the Channel Blur, I would move on to a Fast Blur or Gaussian Blur to soften the whole image a bit more.
Definitely try the Glow plugin as well. If you set your “Glow Operation” to darken, you can muddy up some of the darker areas in your scene.
There are probably several other ways to get the effect you’re looking for. Hopefully these few steps will get you started in the right direction.
Bob