YouTube is a popular online video sharing service.
To import media from YouTube, click the import icon on your Scalar header bar, scroll down to "Other Archives" and select "YouTube". The YouTube Importer will appear, with an option to perform a search of the service.
Once search results are returned, you can preview individual files by clicking their "Preview" links on the right, or select one or more videos to import by clicking their associated checkboxes. Then, clicking the "Import selected media" button at the bottom will bring the media's metadata into Scalar.