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look a sample code below. for more information you can look here

#include "opencv2/imgcodecs.hpp"
#include <iostream>

using namespace cv;

static bool isFileExist( const String& filename )
{
    /// Open the file
    FILE* f= fopen( filename.c_str(), "rb" );

    /// in the event of a failure, return false
    if( !f )
        return false;

    fclose(f);

    return true;
}


int main(int /*argc*/, char** /*argv*/)
{
    Mat test = Mat::zeros(100, 100, CV_8UC1);

    String filename = "test.jpg";

    if( !isFileExist(filename))
        imwrite(filename, test);
    else std::cout << filename  << " exist. not saved" << std::endl;

    return 0;
}