@vicky_mac The old gstreamer versions have memory leaks. Which gstreamer version are you using? Try to upgrade to the latest gstreamer.
Your Qt is old as well. Upgrade your Qt to at least 5.15.2.

@surajj4837 said in Deploy UI file on QNX:

This step is not happening

What does this mean please?
Post error message or describe better what happens.
Do you have CMake in your QNX SDK?

Found what was causing the problem from here.

I don't know why but running without -j4 like this:

there is no error and qt is built successfully. I thought that without -j4 I would see the error message but luckily there was no error.