How to Get ByteStream from IMFCaptureRecordSink?

Hello

I am working on capturing video from device using MFT where in I used IMFCaptureRecordSink for recording captured video.

HRESULT ConfigureVideoEncoding(IMFCaptureSource *pSource, IMFCaptureRecordSink *pRecord, REFGUID guidEncodingType)
{
    IMFMediaType *pMediaType = NULL;
    IMFMediaType *pMediaType2 = NULL;
    GUID guidSubType = GUID_NULL;
	IMFMediaSource **ppMediaSource = NULL;

    // Configure the video format for the recording sink.
    HRESULT hr = pSource->GetCurrentDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_RECORD , &pMediaType);
    if (FAILED(hr))
    {
        goto done;
    }

    hr = CloneVideoMediaType(pMediaType, guidEncodingType, &pMediaType2);
    if (FAILED(hr))
    {
        goto done;
    }


    hr = pMediaType->GetGUID(MF_MT_SUBTYPE, &guidSubType);
    if(FAILED(hr))
    {
        goto done;
    }

    if(guidSubType == MFVideoFormat_H264_ES || guidSubType == MFVideoFormat_H264 || guidSubType == MFVideoFormat_YUY2)
    {
        //When the webcam supports H264_ES or H264, we just bypass the stream. The output from Capture engine shall be the same as
		//the native type supported by the webcam
		hr = pMediaType2->SetGUID(MF_MT_SUBTYPE, MFVideoFormat_YUY2);
    }
    else
    {
        UINT32 uiEncodingBitrate;
        hr = GetEncodingBitrate(pMediaType2, &uiEncodingBitrate);
        if (FAILED(hr))
        {
            goto done;
        }

        hr = pMediaType2->SetUINT32(MF_MT_AVG_BITRATE, uiEncodingBitrate);
    }

    if (FAILED(hr))
    {
        goto done;
    }


    // Connect the video stream to the recording sink.
    DWORD dwSinkStreamIndex;

	if (FAILED(hr))
	{
		goto done;
	}

	hr = pRecord->AddStream((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_RECORD, pMediaType2, NULL, &dwSinkStreamIndex);


	if (hr == MF_E_INVALIDSTREAMNUMBER)
	{
		//If an audio device is not present, allow video only recording
		hr = S_OK;
	}

done:
    SafeRelease(&pMediaType);
    SafeRelease(&pMediaType2);
    return hr;
}

Now I need bytestream from the captured video. I require bytestream for creating ismv.

Please suggest me how can I get Bytestream from IMFCaptureSink.

Thanks