Make the user interface reflect that videos are supported

[Beep6581]

I'm using Meshroom-2021.1.0-linux-cuda10.tar.gz and trying to perform photogrammetry from video. The manual does not explain how to do this, so I'm trying to figure out the scant procedure from issue #232.

The issue is that there is an "Images" panel with a "Drop Image Files / Folders" caption, and a File > Import Images menu, but no mention of video. As a new user, I'm wondering whether my build of Meshroom supports video at all, since there is no mention of it in the user interface. The user interface should mention video if video is supported.

[natowi]

Support for video is not much advertised, as it is rudimentary at the moment.

[stale[bot]]

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