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As you said its a callback function that is called every time a new frame is rendered.
The callback function CameraPlugin::OnNewFrame
can get up to 5 Parameters. The values come directly from the Event (as far as i know). A typical callback will look like this:
void CameraEffectPlugin::OnNewFrame(const unsigned char *_image,
unsigned int /*_width*/,
unsigned int /*_height*/,
unsigned int /*_depth*/,
const std::string &/*_format*/)
{
// some code here
}