Hi,
This is customization and please give it a try. You can check the gstreamer pipeline is good in gst-launch-1.0 command:
$ gst-launch-1.0 rtspsrc uri=_URI_OF_RTSP_SOURCE_ ! rtpjpegdepay ! jpegparse ! nvv4l2decoder mjpeg=1 ! nvoverlaysink
And then apply the pipeline to deepstream-app.
Other users may have experience and can share suggestion.