In Power Mode you can see your Realtime Viewers:
This is a list of the viewers who are watching videos on your site right now. All viewers get a unique Viewer ID (Eg. Viewer #53621), and we provide you with details about when, from which location, and – source the viewer is watching the video.
The green heatmaps show you how much of the video a viewer has seen – the darker green the more times the clip has been seen by the viewer.
You can also see your realtime viewers of a specific live event. Go to the event in your backend and click on Realtime Viewers: