How to pull meta:GstVideoGLTextureUploadMeta buffer in system memory?

[jeyp4]

gst-launch-1.0 -v v4l2src device=/dev/video0 ! image/jpeg,format=I420 ! jpegdec ! vaapih265enc ! vaapidecode ! 'video/x-raw(meta:GstVideoGLTextureUploadMeta), format=BGRA' ! fakesink

Above pipeline works fine.

Can I replace fakesink with appsink to extract BGRA buffer data in system memory?

Currently my appsink callback looks like:

static GstFlowReturn onNewBuffer (GstAppSink *appsink, gpointer userdata)
{

    GstMapInfo map;
    GstSample *sample;
    g_signal_emit_by_name(appsink, "pull-sample", &sample);
    if (sample){
        GstBuffer *buffer = gst_sample_get_buffer(sample);
        gst_buffer_map(buffer, &map, GST_MAP_READ);

        // Do Something //

        gst_buffer_unmap(buffer, &map);
        gst_sample_unref(sample);
        return GST_FLOW_OK;
    }
    return GST_FLOW_ERROR;
}

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