I saw a post from past November asking about SweetFX with no responses. None of the post-processing effects using SweetFX official 1.3 or the current beta 2.0 show up in screenshots or video captured with Action (most current version). I was pointed to this being added in 1.9.2. release, but it doesnt work for me.
I have tried screenshots and video with Dead Space, XCOM and Skyrim and they only show the standard pre-fx graphics. I know another software will capture this, but that software is a resource hog, with very few configuration options, that produces stuttering framerates for me. Mirillis really is the best in this regard. It would be great if Action could do this.