Add a link to the "Using C++ Models in QML Tutorial" video

Change-Id: I1e1d8f3996bf2d187491d50a76852fb82257a42b
Reviewed-by: Venugopal Shivashankar <Venugopal.Shivashankar@qt.io>

src/quick/doc/src/concepts/modelviewsdata/cppmodels.qdoc

@@ -41,6 +41,10 @@ QObjectList or a \l QAbstractItemModel. The first three are useful for exposing
 simpler datasets, while QAbstractItemModel provides a more flexible solution for
 more complex models.
 
+For a video tutorial that takes you through the whole process of exposing a C++
+model to QML, see the
+\l {https://youtu.be/9BcAYDlpuT8}{Using C++ Models in QML Tutorial}.
+
 \section2 QStringList-based Model
 
 A model may be a simple \l QStringList, which provides the contents of the list