WeChat.ServerMessage.XmlMessage.reply_video

You're seeing just the function reply_video, go back to WeChat.ServerMessage.XmlMessage module for more information.
Link to this function

reply_video(to_openid, from_wx_no, timestamp, media_id, title, desc)

回复视频消息 - 官方文档

<xml>
  <ToUserName><![CDATA[toUser]]></ToUserName>
  <FromUserName><![CDATA[fromUser]]></FromUserName>
  <CreateTime>12345678</CreateTime>
  <MsgType>video</MsgType>
  <Video>
    <MediaId><![CDATA[media_id]]></MediaId>
    <Title><![CDATA[title]]></Title>
    <Description><![CDATA[description]]></Description>
  </Video>
</xml>