Ajuda em Duvida no codigo OPENCV

Programação
,
#1

Oi, como posso fazer a técnica de Blending com os pragmas entre um video e uma imagem?

#include <opencv2/core/core.hpp> 
#include <opencv2/highgui/highgui.hpp> 
#include <iostream>
 
 
using namespace cv;
using namespace std;
 
int main()
{
  
 Mat src1, src2, src3;
 /// Read image ( same size, same type )
 src1 = imread("red.jpg");
 src2 = imread("green.jpg");
  
 ///Comparing whether the two images are of same size or not
 int width1 , width2 , height1 , height2;
 width1 =src1.cols; 
 height1=src1.rows; 
 width2 =src2.cols; 
 height2=src2.rows; 
  
 if (width1!=width2 && height1!=height2)
 {
  printf("Error:Images must be of the same size \n");
  return -1;
 }
  
 //Merging two images
 src3=src1 + src2;
 
 if( !src1.data ) { printf("Error loading src1 \n"); return -1; }
 if( !src2.data ) { printf("Error loading src2 \n"); return -1; }
 if( !src3.data ) { printf("Error loading src1 \n"); return -1; }
   
 /// Create Windows
 namedWindow("First Image", 1);
 imshow( "First Image", src1 );
 
 namedWindow("Second Image", 1);
 imshow( "Second Image", src2 );
 
 namedWindow("Blend1 Image", 1);
 imshow( "Blend1 Image", src3 );
 
 waitKey(0);
 return 0;
}

green

red