They place UI elements over the video feed provided on screen by the built in 
video capture window, but they don't have access to the actual video data.

Mark

On 15 Dec 2009, at 16:04, Gabriel Zachmann wrote:

>> There is not currently API for this. The API allows you to place overlays on 
>> the screen, but video data is not delivered to your app until the user is 
>> finished recording.
> 
> So, how do all the so-called augmented reality apps do it?
> 
> Best regards,
> Gabriel.
> 
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