Tracking video plays in google analytics

I am using Articulate Storyline 2 to create videos and post them to my website through an i-frame. I want to be able to track video plays using google analytics (most likely through event tracking), but am a little stuck as to how to do this.  

At the moment I get analytics on people visiting the page but I want to know how many of those people actually click play to watch the video. Is this possible?

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