I am trying to rounding the sides of a background image with border-radius property.
border-radius
Here is my scenario:
I placed a big image in a small division a
Just Updated your Fiddle. Hope this will solve your problem.
DEMO
http://jsfiddle.net/saorabhkr/e94q3/13/
Removed fixed width from this class (.video-thumbnail) and put background-size in your markup where you are adding image/video.