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Well, your code is quite complicated, I didn't test it, and I don't understand all of it either. This is more a comment (but it's too long, so I have to put it as an answer). So a few ideas:

• keep your code simple, it's much easier to find a bug.
• use opencv routines to copy an image (frm.copyTo()) instead of std::move.
• capturing from a webcam doesn't take much time, so it isn't necessary to parallelize it*.

It will be much easier to capture the image, then do the processing in parallel, and when it's ready, capture the next frame. Here's a pseudocode:

Rect roi[10];
Mat frm(480,640,CV_8UC3);
Mat subfrm[10];
for(int i=0;i<10;i++)subfrm[i]=frm(roi[i]);  //define 10 ROIs on the image
while(1){
cap>>frm;   //get the image