How to make the stream viewable only by specific users?

[ghost]

I was looking at the code here (https://github.com/Kickflip/kickflip-docs/tree/master/android).

I see that you can create users and streams for those users. I have been trying to find a way to make a user's streams viewable only by specific users. A scenario would be other users who the user created the streams gave permission to view the stream. Is this possible? If so, how is it done?