"Quick capture" refers to the act of quickly capturing or taking hold of something, whether it be a moment, idea, or object, in a swift and efficient manner. Full definition
Quick Capture lets users access the 10 - megapixel camera by shaking the phone twice, then tapping anywhere on the screen to snap a pic or a selfie. (androidcentral.com)
This includes using the fingerprint sensor as navigation, the Chop Twice for Flashlight, Twist for Quick Capture, to name a few. (androidheadlines.com)
With Quick Capture enabled, two quick flicks of your wrist will launch the camera app, and two subsequent flicks switch between the front and rear camera. (digitaltrends.com)