diff --git a/calibrationCharuco.cpp b/calibrationCharuco.cpp
index c927a65..ad6c456 100644
--- a/calibrationCharuco.cpp
+++ b/calibrationCharuco.cpp
@@ -173,13 +173,17 @@ int main(int argc, char *argv[]) {
             aruco::CharucoBoard::create(squaresX, squaresY, squareLength, markerLength, dictionary);
     Ptr<aruco::Board> board = charucoboard.staticCast<aruco::Board>();
 
+    std::cout << "isok" << std::endl;
+
     // collect data from each frame
     vector< vector< vector< Point2f > > > allCorners;
     vector< vector< int > > allIds;
     vector< Mat > allImgs;
     Size imgSize;
 
-    char key;
+    std::cout << "isok" << std::endl;
+
+    char key = 0;
 
     while(key != 27) {
         Mat image, imageCopy;
@@ -313,5 +317,7 @@ int main(int argc, char *argv[]) {
         }
     }
 
+    cam.stopVideo();
+
     return 0;
 }
\ No newline at end of file