append captued video from camera to previously opened file -qml (qmultimedia -ubuntu)

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()
 
    }
    }

---

i need the pause and resume the webcam video.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.