Using iframe to embed youtube videos in aruco tutorials

modules/aruco/tutorials/aruco_board_detection/aruco_board_detection.markdown

@@ -198,7 +198,9 @@ Finally, a full example of board detection:
 
 Sample video:
 
-[![Board Detection video](http://img.youtube.com/vi/Q1HlJEjW_j0/0.jpg)](https://youtu.be/Q1HlJEjW_j0)
+@htmlonly
+<iframe width="420" height="315" src="https://www.youtube.com/embed/Q1HlJEjW_j0" frameborder="0" allowfullscreen></iframe>
+@endhtmlonly
 
 A full working example is included in the ```detect_board.cpp``` inside the module samples folder.
 

modules/aruco/tutorials/aruco_detection/aruco_detection.markdown

@@ -325,7 +325,9 @@ A basic full example for pose estimation from single markers:
 
 Sample video:
 
-[![ArUco markers detection video](http://img.youtube.com/vi/IsXWrcB_Hvs/0.jpg)](https://youtu.be/IsXWrcB_Hvs)
+@htmlonly
+<iframe width="420" height="315" src="https://www.youtube.com/embed/IsXWrcB_Hvs" frameborder="0" allowfullscreen></iframe>
+@endhtmlonly
 
 A full working example is included in the ```detect_markers.cpp``` inside the module samples folder.
 

modules/aruco/tutorials/charuco_detection/charuco_detection.markdown

@@ -234,7 +234,9 @@ Finally, this is a full example of ChArUco detection (without using calibration
 
 Sample video:
 
-[![ChArUco board detection video](http://img.youtube.com/vi/Nj44m_N_9FY/0.jpg)](https://youtu.be/Nj44m_N_9FY)
+@htmlonly
+<iframe width="420" height="315" src="https://www.youtube.com/embed/Nj44m_N_9FY" frameborder="0" allowfullscreen></iframe>
+@endhtmlonly
 
 A full working example is included in the ```detect_board_charuco.cpp``` inside the module samples folder.
 

modules/aruco/tutorials/charuco_diamond_detection/charuco_diamond_detection.markdown

@@ -154,6 +154,8 @@ as in a simple ArUco marker pose estimation.
 
 Sample video:
 
-[![Diamond markers detection video](http://img.youtube.com/vi/OqKpBnglH7k/0.jpg)](https://youtu.be/OqKpBnglH7k)
+@htmlonly
+<iframe width="420" height="315" src="https://www.youtube.com/embed/OqKpBnglH7k" frameborder="0" allowfullscreen></iframe>
+@endhtmlonly
 
 A full working example is included in the ```detect_diamonds.cpp``` inside the module samples folder.