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It doesn't sound like you running any ROS node to act as a driver for your webcam.
You need to find a driver node for your webcam, and run it in order to make the webcam topics (/camera/image and others) available for other nodes to use.
Most of the laptop webcams I've encountered are internal USB devices; I suspect yours is as well. You can confirm this by looking for webcams and/or unlabeled devices in the output from the lsusb
command.
If you can confirm that your webcam is a USB device, try running one of the ROS driver nodes for USB webcams.