How to use built in camera of my lcd monitor?

My LCD is a Lenovo L2251x and it has a built in camera but I don't know how it works. There's no option in control panel either. I downloaded environment sensing utility and It gives me this message.
"The camera on the display is not connected(by means of a USB interface) or the display is not switched on"
Please kindly tell me what I can do to make it work… Thanks.

Go to windows logo (or the start button) ---> all programs
look for your cam there… I'm sure you'll find something to take a
pic or a video using your cam