Finally, I noticed that there are 2 versions of glib in my system… my bad…
However, It looks I really need to set WITH_GSTREAMER OFF to successfully get rid of this ERROR message:
➜ ~ python
Python 3.8.10 (default, Jun 2 2021, 10:49:15)
[GCC 9.4.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import cv2
**
GLib-GObject:ERROR:../subprojects/glib-2.68.1/gobject/gtype.c:2800:g_type_register_static: assertion failed: (static_quark_type_flags)
Bail out! GLib-GObject:ERROR:../subprojects/glib-2.68.1/gobject/gtype.c:2800:g_type_register_static: assertion failed: (static_quark_type_flags)
[2] 128157 abort (core dumped) python