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The uvc_camera wiki page states that dynamic control of the parameters is still on the TODO list (see here). A quick run through the code reveals that the parameters are being set starting at line 158 in src/uvc_cam.cpp.

The best way to change these parameters would be to set them up these calls through dynamic reconfigure. The driver already prints out the available controls and their ranges, and you can use these as a guide to set the appropriate values in the dynamic reconfigure gui.