Fixed with review comments.

modules/videoio/include/opencv2/videoio.hpp

@@ -650,6 +650,16 @@ public:
     */
     CV_WRAP virtual bool open(int index);
 
+   /** @brief  Open a camera for video capturing
+
+    @overload
+
+    This is an overloaded member function, provided for convenience. It differs from the above function only in what argument(s) it accepts.
+    Parameters are similar as the constructor VideoCapture(int index),except it takes an additional argument apiPreference.
+    @return open(cameraNum + apiPreference).
+    */
+    CV_WRAP bool open(int cameraNum, int apiPreference);
+
     /** @brief Returns true if video capturing has been initialized already.
 
     If the previous call to VideoCapture constructor or VideoCapture::open() succeeded, the method returns

modules/videoio/src/cap.cpp

@@ -606,6 +606,11 @@ bool VideoCapture::open(int index)
     cap.reset(cvCreateCameraCapture(index));
     return isOpened();
 }
+bool  VideoCapture::open(int cameraNum, int apiPreference)
+{
+    cameraNum = cameraNum + apiPreference;
+    return open(cameraNum);
+}
 
 bool VideoCapture::isOpened() const
 {