Information on movie streaming sites

Hi everyone

I'm trying to create my little streaming site and I have one last doubt that until I solve it I will never be able to open this site

I'll explain:

I live in a country that doesn't have ENGLISH as its main language and obviously I can never download many films that come out at the cinema and that aren't released on the various streaming applications because obviously I can't find them

Now, I know that many streaming sites record the audio in the theater and then sync to a Hindi/English source

I'm looking for someone to help me understand how I can synchronize audio recorded at the cinema into a 1080hp video source

Thanks to whoever will help me