How do I specify OpenCV calibration parameters?

[mikqs]

I am trying to pass opencv calibration parameters. How do I enable this type of calibration ? What is the file format ? The file contents and the naming for each parameter ? The required file name ? Where is the documentation for the parser ?

[zongwave]

we do not implement an OpenCV calibration parser, we defined fisheye calibration parameters by ourselves.
https://github.com/intel/libxcam/blob/master/xcore/interface/data_types.h#L85
https://github.com/intel/libxcam/blob/master/xcore/interface/data_types.h#L114

and we implemented calibration parser to get parameters from json or a text file.
https://github.com/intel/libxcam/blob/master/xcore/calibration_parser.cpp