How can I modify the gstreamer source file?

I have a particular gstreamer pipeline I need to use because of some odd software configs.

gst-launch-1.0 udpsrc port=5600 \
! 'application/x-rtp,encoding-name=H264,payload=35' \
! rtph264depay ! h264parse \
! nvv4l2decoder enable-max-performance=1 ! nvvidconv \
! 'video/x-raw(memory:NVMM)' ! nvvidconv ! "Whatever output"

Would anyone know what I would adapt in the build files to support this video stream?