Restrict access to video file

Hi, I am trying to sell digital content (videos) to customers by providing a link to a page (where the video is embedded) and a password (password protected page).

I am not using any type of membership restrict access and I do not intend to. I just simply want for customers who have the password to access the video and watch it. However because I password protected the videos, they are not loading.

What should I do?