Zoom in / Zoom out live view
When live view is on，double taping or spreading gesture can zoom in live view.
The “White Capture” button changes to “Record” and pressing the “Record” button
will start and then stop the recording of a video.
The camera should not explicitly be put into a separate movie mode if such a mode
exists, whether through a dial or switch.
Note: movies cannot be downloaded to the iOS device.
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