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imho, you should try the "multi-head" camera approach described here

VideoCapture cap(0); //a **single** capture instance

for (;;) {
    if (! cap.grab()) break; 
    Mat left,right;
    cap.retrieve(left, 0);
    cap.retrieve(right, 1);
}

imho, you should try the "multi-head" camera approach described here

VideoCapture cap(0); //a **single** capture instance

for (;;) {
    if (! cap.grab()) break; 
    Mat left,right;
    cap.retrieve(left, 0);
    cap.retrieve(right, 1);
}