Here is a "Press to record" variation:
Preview Concept:
Press-To-Record-Animation-To-WebM.html
Download Example:
Press-To-Record-Animation-To-WebM.hype.zip
Press the record button as often as you need and then hit the arrow to download and start a new recording. Make sure to update HYPE.video.js found under Hype.app/resources (in the package) to match the current version of Hype you are using.