If you means catch IP trough Webcam is the ways you can get the IP address of the user that has a webcam with you such as in Yahoo Messenger for example, we already wrote the trick before.
The Idea was simple but need one condition, you had to make an IP to IP or usually called as Peer to Peer connection with the target when you using Webcam or create Video Call. Be default in some of Messenger Service such as AIM, Windows Live Messenger, and Yahoo Messenger, it automatically used Peer to Peer connection.
Then it pretty simple, just read the connection between you and the target from you networks. For complete how to / tutorial just read at here.
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