The videoOutput I mean is
Qt Code: 
  1. Rectangle {
  2.         width: 320
  3.         height: 240
  4.  
  5.         Camera{
  6.             id: camera
  7.         }
  8.  
  9.         VideoOutput {
  10.             id: videoOutput
  11.  
  12.             anchors.fill: parent
  13.             source: camera
  14.         }    
  15.  
  16.         GammaAdjust {
  17.             id: gammaAdjust
  18.  
  19.             anchors.fill: videoOutput
  20.             source: videoOutput
  21.             gamma: 0.5
  22.         }
  23.     }
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How could design the videoOutput by myself?
Maybe this is the fastest and easiest way to save the
image after postprocessing,thanks