Get 401 while getting api .mp4 link

No, because I don’t know what kind of token you want

Please refer to the documentation to determine which kind of token you need. It sounds like you need an App Access Token, but I don’t know what your application/website/tool does, as if your application/website/tool has a logged in user, you’d use the Users oAuth token rather than an App Access Token

Covers the token types, and it’s following section covers what the responses/types are