Grids should be within actual video frame and not the entire window.

src/FlightDisplay/FlightDisplayViewVideo.qml

@@ -50,8 +50,6 @@ Item {
             display:        QGroundControl.videoManager.videoSurface
             receiver:       QGroundControl.videoManager.videoReceiver
             visible:        QGroundControl.videoManager.videoRunning
-        }
-    }
             Rectangle {
                 color:  Qt.rgba(1,1,1,0.5)
                 height: parent.height
@@ -80,4 +78,6 @@ Item {
                 y:      parent.height * 0.66
                 visible: _showGrid
             }
+        }
+    }
 }