`video` should depend on `dnn` in my experience

[JAicewizard]

Before reporting an issue, please first check
the troubleshooting guide. If the issue you're
encountering is not solved thereby please state the following in your bugreport:

1. arch linux
2. Official arch package
3. OpenCV 4.12
4. 1.87.0
5. out.txt

[JAicewizard]

Note that this is fixed when adding the dnn feaure