Currently, if you want to make a preview for a video file 
ActiveStorage::Previewer::VideoPreviewer will pick the first frame of the 
any options to customize this behavior.

Since the first frames are often not very informative(f.e. black start 
screen) I suggest adding the ability to pick a screenshot for a preview 
from a middle of the video.
record.attachment.preview(middle_frame: true)
This API would be convenient, but since the variation isn't passed into the 
previewer, it will require changes not only in VideoPreviewer class.

What will be your thoughts about this feature?
In the case of positive feedback, I'll be glad to start implementation.

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