[CentOS] utility to find which /dev/videoX

is there a utility or SOME method to
determine which /dev/videoX (like /dev/video0 or /dev/video1)
is being used by a device???

Example I have a USB camera and a USB TV module
how do I determine which device is on /dev/video0 and which is on
/dev/video1

I have seen perhaps a way in dmesg but I am looking for the
BEST way and the correct way.

Thanks,

Jerry