LG D959 - Manual (Page 79)

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Tracking focus
Tracks the subject that you've focused on while recording a video.
1 Open the Camera application.
2 Change to video mode and tap Record to start recording.
3 Tap on the subject in the preview screen to track it while you record.
4 Tap to refi ne the focus.
NOTE:
Depending on the selected object and settings, this function may not work.
Camcorder