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#include <opencv2/imgproc/imgproc.hpp>
#include <opencv2/objdetect/objdetect.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>

const char* keys = 
{
	"{i|input| |The source image}"
	"{o|outdir| |The output directory}"
	"{c|cascade| |The cascade file}"
};

int main(int argc, const char** argv)
{
	cv::CommandLineParser parser(argc, argv, keys);
	std::string infile = parser.get<std::string>("input");
	std::string outdir = parser.get<std::string>("outdir");
	std::string cascade_file = parser.get<std::string>("cascade");

	cv::CascadeClassifier cascade;
	if (cascade_file.empty() || !cascade.load(cascade_file))
	{
		std::cout << cv::format("Error: cannot load cascade file! \n");
		return -1;
	}

	cv::Mat src = cv::imread(infile);
	if (src.empty())
	{
		std::cout << cv::format("Error: cannot load source image!\n");
		return -1;
	}

	cv::Mat gray;
	cv::cvtColor(src, gray, CV_BGR2GRAY);
	cv::equalizeHist(gray, gray);

	std::vector<cv::Rect> faces;
	cascade.detectMultiScale(gray, faces, 1.2, 3);

	cv::Mat src_copy = src.clone();
	for (int i = 0; i < faces.size(); i++)
	{
		std::cout << faces[i];
	}

	return 0;
}

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g++ `pkg-config --cflags --libs opencv` facecj.cpp `pkg-config --libs opencv` -o facecj

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konstantin@server:~$ ./facecj 
OpenCV Error: Bad argument (undeclared key 'input' requested) in getByName, file /home/konstantin/my_scpipts/opencv/opencv-3.2.0/modules/core/src/command_line_parser.cpp, line 136
terminate called after throwing an instance of 'cv::Exception'
  what():  /home/konstantin/my_scpipts/opencv/opencv-3.2.0/modules/core/src/command_line_parser.cpp:136: error: (-5) undeclared key 'input' requested in function getByName

Aborted (core dumped)