How to install gstreamer 1.0 badplugin for opencv?

[Roy]

On a *Ubuntu 18.04* machine I am trying to use *opencv 4.1.2* facedetect
<https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-plugins-bad/html/gst-plugins-bad-plugins-facedetect.html>
in
a *gstreamer 1.14.5* pipeline but unfortunately the plugin is not installed.

I downloaded the gstreamer bad plugin code
<https://gstreamer.freedesktop.org/src/gst-plugins-bad/gst-plugins-bad-1.14.5.tar.xz>
and
tried to build using meson The size of the so files created does not look
right.

How do I install the opencv plugin?

(cv) roy at hp:~$ cat /proc/versionLinux version 5.0.0-36-generic
(buildd at lgw01-amd64-060) (gcc version 7.4.0 (Ubuntu
7.4.0-1ubuntu1~18.04.1)) #39~18.04.1-Ubuntu SMP Tue Nov 12 11:09:50
UTC 2019
(cv) roy at hp:~$ which gst-inspect-1.0 /usr/bin/gst-inspect-1.0
(cv) roy at hp:~$ gst-inspect-1.0 --version
gst-inspect-1.0 version 1.14.5GStreamer 1.14.5
https://launchpad.net/distros/ubuntu/+source/gstreamer1.0
(cv) roy at hp:~$ gst-inspect-1.0 facedetectNo such element or plugin 'facedetect'
(cv) roy at hp:~$ pythonPython 3.6.9 (default, Nov  7 2019, 10:44:02)
[GCC 8.3.0] on linuxType "help", "copyright", "credits" or "license"
for more information.>>> import cv2>>> print(cv2.__version__)4.1.2>>>
exit()
(cv) roy at hp:~$ ls -l
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopen*-rw-r--r-- 1 root
root  39752 Jul  4 02:16
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopenal.so-rw-r--r-- 1
root root  23376 Jul  4 02:16
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopenexr.so-rw-r--r-- 1
root root  81896 Jul  4 02:16
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopenglmixers.so-rw-r--r--
1 root root 253048 Jul  3 09:19
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopengl.so-rw-r--r-- 1
root root  48328 Jul  4 02:16
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopenjpeg.so-rw-r--r-- 1
root root  27368 Jul  4 02:16
/usr/lib/x86_64-linux-gnu/gstreamer-1.0/libgstopenmpt.so
(cv) roy at hp:~$ ls -l gst-plugins-bad-1.14.5/gst-libs/gst/opencv/
total 84-rw-r--r-- 1 roy roy  6395 Mar 23  2018
gstopencvutils.cpp-rw-r--r-- 1 roy roy  1700 Mar 23  2018
gstopencvutils.h-rw-r--r-- 1 roy roy  8871 Mar 23  2018
gstopencvvideofilter.cpp-rw-r--r-- 1 roy roy  4559 Mar 23  2018
gstopencvvideofilter.h-rw-r--r-- 1 roy roy   746 Mar 23  2018
Makefile.am-rw-r--r-- 1 roy roy 38511 May 29  2019
Makefile.in-rw-r--r-- 1 roy roy   775 Mar 23  2018
meson.build-rw-r--r-- 1 roy roy  1082 Mar 23  2018 opencv-prelude.h
(cv) roy at hp:~$ ls -l gst-plugins-bad-1.14.5/build/gst-libs/gst/opencv/
total 0
lrwxrwxrwx 1 roy roy 21 Nov 30 08:50 libgstopencv-1.0.so ->
libgstopencv-1.0.so.0
lrwxrwxrwx 1 roy roy 28 Nov 30 08:50 libgstopencv-1.0.so.0 ->
libgstopencv-1.0.so.0.1405.0
(cv) roy at hp:~$

I even tried

(cv) roy at hp:~$ sudo apt install libgstreamer-plugins-bad1.0-dev

(cv) roy at hp:~$ gst-inspect-1.0 facedetect No such element or plugin 'facedetect'
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