Deepak,
In answer to your first question, you can get 30 separate images by using a sequence. You can set it up to acquire any number of images, and it will fill the buffer of images. If you use the same low level routines, you can even set it up to continuously acquire as a circular buffer.
From a camcorder, the only other route for the images to enter the computer is usually firewire. NI's firewire drivers usually won't work with camcorders, because the camcorders compress the images. Currently, I think your only reasonable option is to continue using the PCI-1411.
Bruce
Bruce Ammons
Ammons Engineering