Hi puradchi,
I have already found a solution for the problem of setting required resolution in CVS. Actually, you have to install IMAQ RT or you can just copy IMAQ RT vis from someone else if you dont have it already. There is a vi called IMAQ VIDEO OUT DISPLAY MODE with which you can set the resolution of the CVS programatically from Labview itself.If you set it once it would be enough.That is , if you just initialize it once, it will remain fixed till u change it programatically or restart the CVS.
For your convienience i have attached the vi myself. you can just copy this vi and put it in the Program Files\National Instruments\LabVIEW 7.0\vi.lib\vision\folder and use it wherever necessary
Thanks,
Vasanth
Ya Ya