If I install gstreamex omx does ofVideoPlayer will use it?

Hello,

As I was going to install ofomxplayer, the OF library which support omxplayer, and the openMax decoding functions, I found out there is a gstreamer openmax packages : https://gstreamer.freedesktop.org/releases/gst-omx/1.0.0.html

If I install it, does ofVideoPlayer will automatically use it ?

yes, also install_dependencies.sh should install it too

Ok.

Is it in the main raspbian repo ?

yes, as i said, if you’ve run the install_dependencies script it should be installed already