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I got it working

cvtColor(src,img,CV_BGR2HSV);  //convering src(RGB) to img(HSV)

    Mat A(src.size(),src.type(),Scalar::all(0));  // creating a Matrix A of size src;

    inRange(img,Scalar(170,155,150),Scalar(180,255,230),h1);  //creating mask using inRange.

 src.copyTo(out,h1);   // copying src(RGB) image to out with mask;

This works for me Thanks @berak and @LBerger

I got it working

cvtColor(src,img,CV_BGR2HSV);  //convering src(RGB) to img(HSV)

inRange(img,Scalar(170,155,150),Scalar(180,255,230),h1);  //creating mask using inRange.

src.copyTo(out,h1);   // copying src(RGB) image to out with mask;

This works for me Thanks @berak and and

cvtColor(src,img,CV_BGR2HSV);

Mat A(src.size(),src.type(),Scalar::all(0));
for (int i=0;i<img.rows;i++)
    {
    unsigned char  *hsv=img.ptr(i);
    unsigned char *dst=A.ptr(i);
    for(int j=0;j<img.cols;j++)
        {
        unsigned char H=*hsv++;
        unsigned char S=*hsv++;
        unsigned char V=*hsv++;


 if ( (H>170 && H<=179) && (S>155 && S<255) && (V>150 && V<230) ) {
        *dst++ = H;
        *dst++ = S;
        *dst++ = V; 
    } else {
         dst++;
         dst++;
         dst++;
  }
    }
}

cvtColor(A,out,CV_HSV2BGR);

this also works thanks @LBerger