@Rekab

First of all I am really curious to know why you (not your boyfriend ) is asking about convincing his parents. Don't get me wrong here but I believe he should be the one who should convince his parents not you (as @jiwan already mentioned letting them know about you would be a good idea).But its his responsibility to convince his parents to accept you. You are willing to learn a completely new language, are ready to follow the traditions. You are already putting a lot of efforts here.

"but he says if they get to the point where they will talk on camera to me then they have accepted"
Wait until he will make his parents to accept you. and don't worry too much, eventually he will make them to accept you.

I thought to write what-if scenario here but that would be too harsh so not writing any.

And one more thing, not sure you know it or not , but if you don't like a post you can delete that post by hitting the delete on the post :)