The package of kdenlive provided by Tumbleweed is not including the motion
tracker effect.
The underlying reason for this omission seems to be the missing inclusion of
OpenCV library, which should provide the required capabilities for this effect.
OpenCV library itself is installed on my system, though.

It might therefore be necessary to rebuild this package with inclusion of the
OpenCV library, so that this function becomes available.

Package details:
Name        : kdenlive
Version     : 20.12.3
Release     : 1.1
Architecture: x86_64
Install Date: Sa 13 M���r 2021 21:43:48
Group       : Productivity/Multimedia/Video/Editors and Convertors
Size        : 54691735
License     : GPL-3.0-or-later
Signature   : RSA/SHA256, Mi 10 M���r 2021 14:00:55, Key ID b88b2fd43dbdc284
Source RPM  : kdenlive-20.12.3-1.1.src.rpm
Build Date  : Mi 10 M���r 2021 13:53:16
Build Host  : lamb52
Packager    : https://bugs.opensuse.org
Vendor      : openSUSE