Ok I found out, for some reason you need o move .dll files from GStreamer /bin folder to your application main directory, and in the previous folder copy GStreamer /lib folder
/MyFolder
/my app
/*.dll
/myapp.exe
/lib
*.dll-s from " \gstreamer\1.0\x86_64\bin "
/lib from " \gstreamer\1.0\x86_64 "
A whole lot of files, and it’s breaking my directory organization but it’s finally working - I someone found out how to fix that, please let me know 