Software :: V4l2 Webcam Not Working

I found a following codes along with headers from the link given below,

http://v4l2spec.bytesex.org/spec/capture-example.html

I connected the webcam and compiled the program successfully without any error. When I try to RUN the program I could see some strange things happening but no output. I could see a camera is detecting but I could not see any display on the screen.Here is the compile and execution result of my code.

As you see my output, It just prints a dotted line and stops the execution automatically. While printing the dotted line, I could see my webcam lights switch on for sometime but no display on the screen.

The idea is I need to display and run the webcam on the VLC player.