BeagleBoard-xm does not show captured image

I am designing system to detect Eye blink using OpenCV on Beagle board xm.code can execute efficiently on laptop but unable to show web cam’s output on screen.
It can print text message (mentioned in code )on terminal. but unable to show as input video string.
can any body please help me?
Is problem with my code or with my board ?
and How can I solve it?