function pushFunc() {

    mediaRecorder.requestData();
    console.log(mediaRecorder.state);

    mediaRecorder.ondataavailable = function (e) {
        console.log("data size: ", e.data.size);
        var encodeData = new Blob([e.data], { type: 'video/mp4' });
        postBlobData(encodeData);
    }

}


function postBlobData(blob) {

    var formData = new FormData();

    formData.append("blobContent", blob);

    var request = new XMLHttpRequest();
    request.open("POST", "/Device/Upload");
    request.send(formData);
}

**File: DeviceController.cs**

[HttpPost]
        public string Upload(HttpPostedFileBase blobContent)
        {
            ...
            // return View();
        }