Track video play events

[ddfridley]

undebates are being rendered at iframe's in other pages. We need to track when the play button is getting pressed, and ideally which videos are getting played as a voter goes through the stages in the conversation.

Can google tags be used to collect this data and then google analytics to show it along side the other traffic data.

https://developers.google.com/analytics/devguides/collection/app-web/tag-guide