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Real objects from video feed above virtual game objects

I have created a marker image and added 3d vehicles on it. But when i slide my hand towards 3D vehicles is goes behind those 3D vehicles. How can i make changes to project so that my hand or other real objects from video feed come in front of 3D virtual vehicles? ... I have added a link of screenshot which shows my hand behind vehicles and fence.http://xintsolutions.com/demo/screenshot.png