This new tutorial is about building Kodi.
Step 1 : You need to enable the opengl driver of the rpi
Step 2 : build kodi
sudo apt build-dep kodi sudo apt install uuid-dev libcrossguid-dev git clone https://github.com/xbmc/xbmc --depth=1 cd xbmc ./bootstrap ./configure --disable-openmax make sudo make install
After you can launch kodi with :
Fullscreen mode or windowed mode works
There is only sofware decoding until it will be implemented in opengl driver, but it work good on rpi 3 with 720p videos.