It’s called “Lens Whacking“. Over the years indie filmmakers came up with a way to make incredible optical lighting artifacts inside the camera by removing the lens while shooting, then hovering it over the sensor to allow light to come in, thus creating an on-the-fly dreamy light effect.
Lens Whack is a product that gives you that simulated Lens Whacking effect in post production, without you having to try to focus and film while hovering your lens over the sensor…and you don’t risk breaking anything either! Home Page - http://cineflare.com/lens-whack/ 
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