I was curious, so just for a comparison I used pacman to install each of openshot, kdenlive, and pitivi (on separate pretty much pristine install builds of the WDL_Arch64 distro I use). The result itself doesn't mean much since of course depends what libs and so on are already installed on system, but at least for my use Pitivi is smaller install than openbox or kdenlive, but shotcut much smaller still (haven't tried using the latter). However, my family are kdenlive fans and to be honest the disk storage size difference (and its in MiB, not GiB here) doesn't make it worthwhile for me to bother using the "smallest installed size". Being from Arch Linux, these will be pretty close to most recent stable packages:
per pacman -Sy output:
Pitivi (pitivi-2021.05-3):
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Total Download Size: 35.81 MiB
Total Installed Size: 157.89 MiB
qt5 Openshot (openshot-2.6.1-5):
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Total Download Size: 115.60 MiB
Total Installed Size: 375.30 MiB
Kdenlive (kdenlive-21.12.1-1):
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Total Download Size: 125.49 MiB
Total Installed Size: 489.58 MiB
Flowblade (flowblade-2.8.0.3-3):
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Total Download Size: 62.21 MiB
Total Installed Size: 234.54 MiB
Shotcut (shotcut-22.01.30-1):
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Total Download Size: 17.04 MiB
Total Installed Size: 77.66 MiB
Basically you can install ALL of above in this scenario in less that 1GB compared to the use of huge flatpaks (or snap) for each.
I don't have Blender installed at the moment, but family members use that a lot so, for comparison (since it does have some kind of video editor included in its code):
Blender (blender-17:3.0.1-1) is huge...:
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Total Download Size: 221.69 MiB
Total Installed Size: 969.40 MiB
Just for comparison image is of Shotcut since already seen Pitivi. And the video is of same old waterpump I have...
In reality, our default WDL_Arch64 install includes okular, which is a kde pdf app and qt5 I think, so involves lots of huge extra libs anyway. With these installed I expect much smaller install sizes for some of the above.