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These are only warnings so you're camera node should be running okay and publishing images. Have you started RVIZ and tried to view the image topic?

The first warning is caused because you haven't calibrated the camera lens model and linked this into the launch file. If you're not estimating geometry from images then you will not need this anyway. If you need to calibrate the camera this is described here.

The second warning appears to state that your USB camera hardware doesn't support switching between auto and manual focus. I wouldn't worry about this one either.