Is Blender capable of additive animation blending or not?

Support Animation and Rigging
#1

For example, to layer spine animation (breathing, turning around, etc) over another, fullbody animation? Trying to figure out NLA by myself gives me existential crisis. I need to know for sure if it is possible or not

#2

Here is a video that might be helpful

#3

It’s inside NLA’s N-panel:
nla_add

Don’t know for 2.8 but in 2.7x it was broken without add-on