what is the new iOS 7 feature called "swipe to capture"
The iOS7 update enabled Swipe to Capture – allowing you to switch between camera modes like Photo, Video, Square and Panorama with a swipe.

The iPhone 5, iPhone 4, iPhone 4S, iPad 4, iPad 3, iPad mini, and 5th-gen iPod touch have this feature, while only the iPad 2 does not.