how to count number of vehicles

I have seen a demo from

http://www.mathworks.in/products/computer-vision/code-examples.html?file=/products/demos/shipping/vision/videotrafficgmm.html

from this can anyone tell how to count the number of vehicles plz

[Gnaneswar Nadh satapathi]

The count gives the number of cars

[kash]

no it gives for each frame,but i need for whole video