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usb_cam and gscam are not appropriate for what you're trying to do; they're for using webcams that you connect to your computer using USB.
I'm not aware of a ROS driver for the SJ4000. It looks like a fairly new camera, so I suspect no one has developed a ROS driver for it yet. You'll probably need to write your own driver.
A few places to start:
image_transport::CameraPublisher
.