Venu,
Since images from your camera should be coming in at a consistant rate, you may want to consider using the sequence or ring function that implements a skip count. This tells the board how many frames to skip between acquisitions. So on a camera sending 30fps, you would want to set the board up to skip 29 images so you get 1 frame per second. I hope this method helps to give you ideas.
Best Regards,
Chris D
NI Application Engineer