Qt3D with QtMultimedia Camera

main.qml

import QtQuick 2.7
import QtQuick.Controls 2.0
import QtQuick.Layouts 1.0
import QtMultimedia 5.5 as MM
import QtQuick.Scene3D 2.0

import Qt3D.Core 2.0
import Qt3D.Render 2.0
import Qt3D.Input 2.0
import Qt3D.Extras 2.0

ApplicationWindow {
    visible: true
    width: 640
    height: 480
    title: qsTr("Hello World")

    Rectangle {
        anchors.fill: parent

        MM.VideoOutput {
            anchors.fill: parent
            autoOrientation: true
            source: MM.Camera {
            }
        }

        // TODO: Move position bindings from the component to the Loader.
        //       Check all uses of 'parent' inside the root element of the component.
        //       Rename all outer uses of the id "camera" to "loader_Scene3D.item.camera".
        Component {
            id: component_Scene3D
            Scene3D {
                property alias camera: inner_camera

                //anchors.centerIn: parent
                width: 300
                height: 300

                Entity {
                    Camera {
                        id: inner_camera
                        projectionType: CameraLens.PerspectiveProjection
                        fieldOfView: 45
                        aspectRatio: 16/9
                        nearPlane : 0.1
                        farPlane : 5000.0
                        position: Qt.vector3d( 0.0, 0.0, 5.0 )
                        upVector: Qt.vector3d( 0.0, 1.0, 0.0 )
                        viewCenter: Qt.vector3d( 0.0, 0.0, 0.0 )
                    }

                    components: [
                        RenderSettings {
                            activeFrameGraph: ForwardRenderer {
                                clearColor: Qt.rgba(0, 0.5, 1, 1)
                                camera: camera
                            }
                        },
                        // Event Source will be set by the Qt3DQuickWindow
                        InputSettings {
                        }
                    ]
                }
            }
        }

        Loader {
            id: loader_Scene3D
            anchors.centerIn: parent
//            sourceComponent: component_Scene3D
        }

        Button {
            anchors.centerIn: parent
            text: "Load Scene3D"
            onClicked: loader_Scene3D.sourceComponent = component_Scene3D
        }
    }
}