As mentionned by another user,
https://powerusers.microsoft.com/t5/Stream-Forum/Stream-API-documentation/m-p/4219#M16
And you guys mentionned to put it here.
It would be nice to have API documentation to play with the preview. I'd like to see if we could integrate it in our companies products and projects.
The general idea is to be able to play videos and channels on a communications platform and not just via a browser.