declarative-camera.qml Example File

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 import QtQuick 2.0
 import QtMultimedia 5.4

 Rectangle {
     id : cameraUI

     width: 800
     height: 480

     color: "black"
     state: "PhotoCapture"

     states: [
         State {
             name: "PhotoCapture"
             StateChangeScript {
                 script: {
                     camera.captureMode = Camera.CaptureStillImage
                     camera.start()
                 }
             }
         },
         State {
             name: "PhotoPreview"
         },
         State {
             name: "VideoCapture"
             StateChangeScript {
                 script: {
                     camera.captureMode = Camera.CaptureVideo
                     camera.start()
                 }
             }
         },
         State {
             name: "VideoPreview"
             StateChangeScript {
                 script: {
                     camera.stop()
                 }
             }
         }
     ]

     Camera {
         id: camera
         captureMode: Camera.CaptureStillImage

         imageCapture {
             onImageCaptured: {
                 photoPreview.source = preview
                 stillControls.previewAvailable = true
                 cameraUI.state = "PhotoPreview"
             }
         }

         videoRecorder {
              resolution: "640x480"
              frameRate: 30
         }
     }

     PhotoPreview {
         id : photoPreview
         anchors.fill : parent
         onClosed: cameraUI.state = "PhotoCapture"
         visible: cameraUI.state == "PhotoPreview"
         focus: visible
     }

     VideoPreview {
         id : videoPreview
         anchors.fill : parent
         onClosed: cameraUI.state = "VideoCapture"
         visible: cameraUI.state == "VideoPreview"
         focus: visible

         //don't load recorded video if preview is invisible
         source: visible ? camera.videoRecorder.actualLocation : ""
     }

     VideoOutput {
         id: viewfinder
         visible: cameraUI.state == "PhotoCapture" || cameraUI.state == "VideoCapture"

         x: 0
         y: 0
         width: parent.width - stillControls.buttonsPanelWidth
         height: parent.height

         source: camera
         autoOrientation: true
     }

     PhotoCaptureControls {
         id: stillControls
         anchors.fill: parent
         camera: camera
         visible: cameraUI.state == "PhotoCapture"
         onPreviewSelected: cameraUI.state = "PhotoPreview"
         onVideoModeSelected: cameraUI.state = "VideoCapture"
     }

     VideoCaptureControls {
         id: videoControls
         anchors.fill: parent
         camera: camera
         visible: cameraUI.state == "VideoCapture"
         onPreviewSelected: cameraUI.state = "VideoPreview"
         onPhotoModeSelected: cameraUI.state = "PhotoCapture"
     }
 }