The Twitch Video Widget is a great way to add live twitch videos to your Composition.
To learn how to add a Widget to your Composition, click here.
As seen above, select the "Twitch Video" tab in the Property Panel to update this widget's following property types:
Twitch Channel Name - Box to enter a Twitch channel name (E.g. Ninja, Rtoodtoo222, P4wmykov). Note that this channel must be live streaming for a video to appear.