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Everything works when I tried the aboves on my local computer, are there any additional steps I need to make so I can use my webcam in a docker image?

yes: mount the device file into your Docker container (using -v or --volume), similar to how you would do that with other files and directories.

This is not really a ROS issue btw: I would suggest you try to search for how to make Linux device files available to/in Docker containers.