pause and resume caputured webcam video (Qtmultimedia 5.0)

Greetings to everyone
I am using Qtmultimedia 5.0 to record and capture video from webcam. The example provided by Qt helped me very much. I could record and stop the captured video using the following code.

Code:

---

Camera {
            id: camera
        }
 
       Rectangle{
        Text{
          text: qsTr("Record")
        }
        MouseArea{
            onClicked: camera.videoRecorder.record()
 
        }
    }
 
       Rectangle{
        Text{
          text: qsTr("Stop")
        }
        MouseArea{
            onClicked: camera.stop()
 
        }
    }

---

Now i need the pause and resume the webcam video. Is there any function to do that job. If I resume the video it should append to the opened file.

by default the recorded video is saved in mkv format. file is being closed when i use camera.stop(). when camera.start() is called ,it is saving in new file. I need to append the current video to the previously recorded video. pls help.