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It does not matter whether dynamic_reconfigure is used in sensor, camera or any other specific ROS package. To get some understanding of how to implement dynamic reconfigure in your package check the dynamic reconfigure tutorials. They give a good step by step tutorial of how to write your .cfg file and set up dynamic reconfigure in your node.

If you want an example of a simple implementation of dynamic reconfigure you can check the pose_follower package where you can find the implementation in the latest commit.