video message

{
    "receiver": "01234567890A=",
    "min_api_version": 1,
    "sender": {
        "name": "John McClane",
        "avatar": "http://avatar.example.com"
    },
    "tracking_data": "tracking data",
    "type": "video",
    "media": "http://www.images.com/video.mp4",
    "thumbnail": "http://www.images.com/thumb.jpg",
    "size": 10000,
    "duration": 10
}