Arch Linux

Description:
With the latest version of Kdenlive. The software gained advanced abilities like motion tracking. For motion tracking at least one needs opencv installed.

Adding "opencv: For Motion Tracker effect" would probably be sufficient, but I am not sure if there are other effects depending on it.

Additional info:
* package version(s) 20.04.0-1

Steps to reproduce:
IRC chat in #kdenlive on freenode:
[13:40:47] <scrumplex> Hey there! Do I need to install something extra for the motion tracker in Kdenlive 20.04?
[13:40:59] <scrumplex> I updated today (Arch Linux repos) and can't find the effect
[13:45:20] <scrumplex> looks like kdenlive from flathub also does not have this
[14:08:06] <IrcsomeBot> <Vincent Pinon> hi, you must have opencv build with contrib module
[14:08:21] <IrcsomeBot> <Vincent Pinon> the only package I am sure to contain it is our appimage