HTC rhyme Mode D'Emploi

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Zooming
Before taking a photo or video, you can first use the onscreen zoom bar to
zoom in or out of your subject.
Simply slide your finger on the zoom bar to zoom in or out. 
When you're recording video, the zoom bar is always shown onscreen. You
can freely zoom in or out while recording.
Auto focusing
Whenever you point the camera at a different subject or location, it shows
the auto focus indicator at the center of the Viewfinder screen.
Let the camera auto focus on the center of the screen. Or you can tap
another area on the screen that you want to focus on.
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Camera