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no, unfortunately you cannot define your own colorspace.

an efficient way to do so will be quite advanced, just look at imgproc/src/color.cpp, to get an impression.

i can only offer an "easy to use" solution with transform

Mat bgr = ... // input
Mat ycgco;    // output
Mat_<float> m(3,3);  // values taken from wikipedia
m << .25, .5,  .25,
    -.25, .5, -.25,
     .5,   0, -.5;

transform(bgr, ycgco, m);