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The default parameters for usb_cam are unlikely to work, you'll need to discover them and then have a rosrun like:

rosrun usb_cam usb_cam_node _image_width:=1280 _image_height:=720 _framerate:=15 _video_device:=/dev/video0 _pixel_format:=mjpeg

You can use guvcview to determine working resolutions and formats, or a command line like

v4l2-ctl --device=0 --list-formats-ext

I've written this up here (and a lot of other related ros webcam tips): https://gist.github.com/lucasw/85dc92c9f5146e9d5175a33b49ef4a90