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With a simple statement, a list of connected USB devices can be retrieved:
lsusb
The result could look something like this:
Bus 001 Device 002: ID 0424:9512 Standard Microsystems Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 003: ID 0424:ec00 Standard Microsystems Corp.
Bus 001 Device 004: ID 05e3:0510 Genesys Logic, Inc.
Bus 001 Device 005: ID 045e:00b4 Microsoft Corp. Digital Media Keyboard 1.0A
In this case there are 2 devices connect; a webcam (Genesys Logic, Inc.) and a Microsoft keyboard.
To find out the details and capabilities of your webcam try:
lsusb -s 001:004 -v
(where 001 the Bus number is and 004 the Device number)
This can produce a pretty lengthy list of specs, so you might want to consider using:
lsusb -s 001:004 -v | less
