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Have you tried waiting few minutes for the window to unfreeze? I know that camera_calibration window can freeze up to 10 minutes after clicking the "calibrate" button (this is even stated in the documentation). From what I understand, in your case the gui freezes at the start?
According to the camera_calibration, there is also a camera parameter in the command:

rosrun camera_calibration cameracalibrator.py --size 8x6 --square 0.108 image:=/my_camera/image camera:=/my_camera