upload video on folder with compressed

Question

  I can upload video on folder but i cant compress it.

[HttpPost]

        public HttpResponseMessage UploadFiles()
        {
            //Create the Directory.
            string path = HttpContext.Current.Server.MapPath("~/Video/");
            if (!Directory.Exists(path))
            {
                Directory.CreateDirectory(path);
            }

            //Fetch the File.
            HttpPostedFile postedFile = HttpContext.Current.Request.Files[0];

            //Fetch the File Name.
            string fileName = HttpContext.Current.Request.Form["fileName"] + Path.GetExtension(postedFile.FileName);

            //Save the File.
            postedFile.SaveAs(path + fileName);

            //Send OK Response to Client.
            return Request.CreateResponse(HttpStatusCode.OK, fileName);
        }
    }