Merge pull request #16275 from andybrucenet:fix_vector_insert

* Ticket 16274: Fix compile error on std::vector.insert

* See https://github.com/opencv/opencv/issues/16274

samples/cpp/tutorial_code/gapi/face_beautification/face_beautification.cpp

@@ -438,20 +438,20 @@ GAPI_OCV_KERNEL(GCPUGetContours, GGetContours)
             // Approximating the lower eye contour by half-ellipse (using eye points) and storing in cntLeftEye:
             cntLeftEye = getEyeEllipse(vctPtsFaceElems[i][1], vctPtsFaceElems[i][0]);
             // Pushing the left eyebrow clock-wise:
-            cntLeftEye.insert(cntLeftEye.cend(), {vctPtsFaceElems[i][12], vctPtsFaceElems[i][13],
+            cntLeftEye.insert(cntLeftEye.end(), {vctPtsFaceElems[i][12], vctPtsFaceElems[i][13],
                                                  vctPtsFaceElems[i][14]});
 
             // A right eye:
             // Approximating the lower eye contour by half-ellipse (using eye points) and storing in vctRightEye:
             cntRightEye = getEyeEllipse(vctPtsFaceElems[i][2], vctPtsFaceElems[i][3]);
             // Pushing the right eyebrow clock-wise:
-            cntRightEye.insert(cntRightEye.cend(), {vctPtsFaceElems[i][15], vctPtsFaceElems[i][16],
+            cntRightEye.insert(cntRightEye.end(), {vctPtsFaceElems[i][15], vctPtsFaceElems[i][16],
                                                    vctPtsFaceElems[i][17]});
 
             // A nose:
             // Storing the nose points clock-wise
             cntNose.clear();
-            cntNose.insert(cntNose.cend(), {vctPtsFaceElems[i][4], vctPtsFaceElems[i][7],
+            cntNose.insert(cntNose.end(), {vctPtsFaceElems[i][4], vctPtsFaceElems[i][7],
                                            vctPtsFaceElems[i][5], vctPtsFaceElems[i][6]});
 
             // A mouth:
@@ -460,7 +460,7 @@ GAPI_OCV_KERNEL(GCPUGetContours, GGetContours)
                                          vctPtsFaceElems[i][10], vctPtsFaceElems[i][11]);
 
             // Storing all the elements in a vector:
-            vctElemsContours.insert(vctElemsContours.cend(), {cntLeftEye, cntRightEye, cntNose, cntMouth});
+            vctElemsContours.insert(vctElemsContours.end(), {cntLeftEye, cntRightEye, cntNose, cntMouth});
 
             // The face contour:
             // Approximating the forehead contour by half-ellipse (using jaw points) and storing in vctFace: