I have customized my kernel Image using eglibc. full kernel image
I have checked packages by executing command "$opkg list_installed"
but I am not able to figure out which kind of package is require to interface USB webcam with intel galileo
Take a look at this link http://stackoverflow.com/questions/4835146/capturing-webcam-stream-in-python-using-opencv-need-help , in there is an issue similar to yours. I hope you find this useful. Let me know if it helps.