Nvidia Background remover in Disguise - How to implement Backgound

right after writing this post i found the solution myself, sorry for that and for those who are interested:

i added another image2D and another videoloader which i then exposed as “BACKGOUND” where i can now pipe my background layer into in disguise.

if anyone knows a better way, please let me know!

Screenshot 2024-04-19 135412