One of the new additions in Facebook Ads is the Pay per view video ads. You can set the objective of your ads as optimized for Video Views.
In my experience, video advertising cost per view is much lower compared to the results of ads using other objectives.
Result of Campaign
When you create your Video Views Facebook Ad in Power Editor, you have the option to create custom audiences of everyone who watched the video and a separate audience who watched the video until the end.
This is useful for retargeting when creating your ads in the future.