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From the shell/commandline, you can determine the capabilities of your USB webcam quite simple (works for most, but not for all webcams).
$ lsusb
Bus 001 Device 002: ID 5986:0241 Acer, Inc BisonCam, NB Pro
...
This lists all USB devices. Find your webcam and write down BUS (001) and DEVICE (002) number.
We will use them in this statement:
lsusb -s 001:002 -v
This statement will show ALL details of your webcam/USB device which can be overwhelming. If you're only interested in video modes, try:
lsusb -s 001:002 -v | egrep "Width|Height"
wWidth 640
wHeight 480
wWidth 1280
wHeight 1024
...
