make root

apt install git autoconf automake libtool pkg-config libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libraspberrypi-dev gstreamer-tools gstreamer1.0-omx
cd /home/pi
git clone https://github.com/thaytan/gst-rpicamsrc.git
cd gst-rpicamsrc
autoreconf -i
autoconf
./configure
make -j4
sudo make install

build lib srt

apt install cmake-data libjsoncpp1 librhash0 libuv1 tcl8.6
git clone https://github.com/Haivision/srt.git
git checkout tags/v1.4.1
./configure
make -j4
sudo make install

build gst srt (build gst bad with srt support)

enable src packages in /etc/apt/sources.list
sudo apt build-dep gstreamer1.0-plugins-badn
git clone https://github.com/GStreamer/gst-plugins-bad.git
git checkout -b 1.14.5 1.14.5
meson build
ninja -C build
sudo cp build/ext/srt/libgstsrt.so /usr/lib/arm-linux-gnueabihf/gstreamer-1.0/