I am updating this thread. There is big chance that this video is half hoax. But not entire video just Tito selling Potočnik's plans and Yugoslavia having space program.

Which part wasn't a hoax then in a movie about the Yugoslavian space program? That a country called Yugoslavia existed? (to be honest I am having problems believing that part too)

If i am correct you are just sarcastic right?

Problem is that Yugoslavia officialy didnt have Space Agency thats why i have some doubt's. Also the guy that made this trailer is known for making comedies thats why i am suspicious.