Oh then I missunderstood that. It is called Distrotion Mode or Box in A:M.
There is a modifier in Actions which is called "Distort" which should do that, but I never used it before...
It has to be added to the action and you will have to have a bone in your model with attached CPs to define what is manipulated I think, but I am not very deep into that topic currently.
I am pretty sure Robert can tell you more about it.
Best regards
*Fuchur*