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it's possible of course

Suppose you are grabbing in cv::Mat m1,m2,m3,m4; that have same size and type

//define the tiled image so that it can contains 4 images
Mat tile
tile = Mat(2*m1.size(),m1.type());

//define 4 ROI where the single images will be copied to
Rect r1,r2,r3,r4;
r1 = Rect(0,0,m1.size());             // top left
r2 = Rect(m1.cols,0,m1.size());       // top right
r3 = Rect(0,m1.rows,m1.size());       // bottom left
r4 = Rect(m1.cols,m1.rows,m1.size()); // bottom right

// Transfer the image into tiled one
m1.copyTo(tile(r1));    m2.copyTo(tile(r2));
m3.copyTo(tile(r3));    m4.copyTo(tile(r4));

cv::imshow("Tiled images", tile);