Continuing setup on another page and/or modal a bad practice?

Background

I'm working on a project involving configuring live video feeds (contrast, brightness, focus, etc). This is a very rough sketch of how the layout of the UI looks like:

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Each grey box represents a category of settings. This is a view of one live feed. The UI can show an indefinite amount of live feed that the user can "open". Think of it like tabs or profiles. The above picture represents the view of one such feed, and the user can go "back" and select another feed to view and configure. Basically:

<Feed overview page>
  <Feed 1 page>
  <Feed 2 page>
  ...
<Settings page>

I am now working on a new feature, which I cannot disclose the name or type of (sorry about that), but I can generalize a few things about it. I'll just call it foo bar hence forth:

  1. It needs to be configurable in the Settings page and then "applied" to one or multiple feeds. In other words, you configure foo bar once and can then reuse it in any feed.
  2. As above, but the user should also be able to configure the same setting from within a feed page. Setting the feature here will apply it to the open feed, but will be available for other feeds to use too.
  3. The nature of the setting requires the video to be fairly big in size. Not necessarily fullscreen, but a thumbnail or anything small or medium sized will not suffice.
  4. The user should be able to select, edit and delete an existing foo bar or create a new one.

My proposal so-far

A feed without any applied foo bar setting:

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Clicking it allows the user to select a previously created foo bar, or create a new one. (The video here is small because it serves the purpose as a preview - creating a new foo bar would require a much larger video area):

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How selecting an existing foo bar looks like:

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My issue

And here's where I am stuck. In the case where the user wants to create a new foo bar - and taking into account that we need to give the user a much larger video area to work on - what is the best flow from here? Again, the video area here, in black, is just for preview - it cannot be used for the config itself.

Do I transition from here to a window/modal where the video is much larger? Do I redirect to the Settings page instead, and then back again once finished?

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Any ideas or suggestions? Thanks.

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