Vector Displacement Map with Post Processing?

Hi sorry if my english is not perfect im french ^^
I want to know if someone know how to make a pass of vector displacement mapping ?

Do you mean this?
For Cycles there is in View Layer properties → Passes → Data a Vector which delivers a “speed vector pass” (only for animations, because no movement no speed…).

No I want a vector displacement map pass there’s no vdm pass by default