I followed the guide and figuring out other parts on my own I was able to successfully try out the rtph265pay and rtph265depay elements. However there are some problems with the guide overall for building gstreamer.
This procedure should be inserted after step 6 as liborc provided by Ubuntu 14.04 is way too old to be usable by gstreamer ./configure:
Build orc (Oil Runtime Compiler) to enable high performance code generation:
Step 9’s libjack-dev caused libjack-jackd2-0 and libjack-jackd2-dev to be removed, no idea if they’re important as my tests didn’t involve audio anyway.
Step 10 I skipped installing libopencv-dev cause it wanted to remove libopencv4tegra and libopencv4tegra-dev. And I didn’t need opencv support at the time.
Step 12 has a typo where it used gst-1.6.0 instead of gst_1.6.0 like the rest of the commands for the build parent directory.
Step 13 doesn’t make any sense. There is no apt package named nvidia_gstreamer-1.0 nor is there a directory named that I could find. Instead I had to guess and copy libraries required for my tests:
cp libgstnv* libnvgst* libgstomx.so ~/gst_1.6.0/out/lib/gstreamer-1.0/
So the user guide needs some clarifications and corrections.