RTSP streaming from Jetson nano


I want to setup a rtsp server on Jetson nano.I used gst-rtsp-server for setting up the rtsp server .Frames are capturing using the opencv api.The opencv frames are pushing using the pipeline shown below.

'appsrc name=source format=GST_FORMAT_TIME ’ 'caps=video/x-raw,format=BGR,width=640,height=480,framerate={}/1 ’ '! videoconvert ! video/x-raw,format=I420 ’ ‘! x264enc speed-preset=superfast tune=zerolatency ‘’! rtph264pay config-interval=1 name=pay0 pt=96’.format(self.fps)

My doubt is encoder in the above pipelilne is hardware encoder or not?How can i confirm the same?
I have one more doubt .that is opencv with jetpack 4.3 is bult with cuda or not?
please help me