Putting up Vimeo examples of track use.

I am just asking if it’s allowed to put up examples of Vimeo films where they have been used by buyers on your pages here.
If this is not allowed then I would need to know.

I have only sold 6 tracks so far but two of them have good Vimeo films I would like to put on the website. Do I need to get permission from the buyers? thanks. Susan.