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I went a bit deeper in my search and found the following code, reffered to by this tutorial. It is for the HAAR like classifiers to create intermediate files: http://note.sonots.com/SciSoftware/haartraining.html#v6f077ba

#include "opencv2/objdetect/objdetect.hpp"
#include "opencv2/highgui/highgui.hpp"

#include <ctype.h>
#include <stdio.h>

static void help(void)
{
    printf("\n This sample demonstrates cascade's convertation \n"
    "Usage:\n"
    "./convert_cascade --size=\"<width>x<height>\"<convertation size> \n"
    "                   input_cascade_path \n"
    "                   output_cascade_filename\n"
    "Example: \n"
    "./convert_cascade --size=640x480 ../../opencv/data/haarcascades/haarcascade_eye.xml ../../opencv/data/haarcascades/test_cascade.xml \n"
    );
}

int main( int argc, char** argv )
{
    const char* size_opt = "--size=";
    char comment[1024];
    CvHaarClassifierCascade* cascade = 0;
    CvSize size;

    help();

    if( argc != 4 || strncmp( argv[1], size_opt, strlen(size_opt) ) != 0 )
    {
        help();
        return -1;
    }

    sscanf( argv[1], "--size=%ux%u", &size.width, &size.height );
    cascade = cvLoadHaarClassifierCascade( argv[2], size );

    if( !cascade )
    {
        fprintf( stderr, "Input cascade could not be found/opened\n" );
        return -1;
    }

    sprintf( comment, "Automatically converted from %s, window size = %dx%d", argv[2], size.width, size.height );
    cvSave( argv[3], cascade, 0, comment, cvAttrList(0,0) );
    return 0;
}

#ifdef _EiC
main(1,"facedetect.c");
#endif

However, even when creating a partial HAAR like model, this doesnt work. I use following command:

convert_cascade.exe -size="36x47" tempFolder output.xml

It says that the input cascade could not be found. However, the tutorial, which is referred to alot, does suggest that this should work. Anyone knows what could be the problem.