I'm assuming you have used the Camera Calibrator app to calibrate the camera. After the calibration is done and when you are satisfied with the results (look here for more information), you can export the camera parameters to an object (more info here).
This exported object has information about the camera parameters like the 'IntrinsicMatrix', 'RadialDistortion', etc. which can be accessed through the standard dot notation like so:
cameraParams.IntrinsicMatrix
More information about these parameters can be found here. Depending on the application, you can use these parameters to work on the images captured by this camera. As an example, if you want to remove the radial distortion from an image captured by this camera, you can use the
cameraParams.RadialDistortion
