Gstreamer indeed doesn’t look to be part of the default Linux distribution.
The normal way to get it in is to modify and rebuild the Linux distribution using Yocto, so that:
- the matching libs are provisioned on the device file system (once you’ve installed your modified Linux image)
- the libs/headers you need in your code are available in the toolchain built with your modified Linux
I’m not used to do it, but maybe @CoRfr can give some clues on how to modify the Yocto configuration for your specific needs?