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It is possible:

int fourcc = cap.get(CAP_PROP_FOURCC);
string fourcc_str = format("%c%c%c%c", fourcc & 255, (fourcc >> 8) & 255, (fourcc >> 16) & 255, (fourcc >> 24) & 255);
cout << "CAP_PROP_FOURCC: " << fourcc_str << endl;