Action Details
Requirements and how-to articles for Twitch's action:

Requirements
You need this to get it done:

SSL Compliance
Twitch requires all ads and 3rd party vendors to be SSL compliant. All components of video and display ads including creative and tracking must be able to serve via SSL (https).
Banner Tracking
Third Party Tracking: 1x1 impression tracking pixels (non-redirecting)
Trackable Events: Start, 30 second view, 2 minute View
Accepted Vendors: DCM/Sizmek
Banner File Specs
Dimensions: 600 x 800 pixels
File Format: .jpg/.png
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How-To Articles
A list of useful links for you:

0
Twitch Advertising - Bounty Board
Twitch official guide for the Bounty Board.
Official
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