TextTrackKind
public enum TextTrackKind : Intextension TextTrackKind: CodableDescribes the kind of the text track.
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                  The text track contains subtitles. DeclarationSwift case subtitles = 1
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                  The text track contains closed captions, a translation of dialogue and sound effects. DeclarationSwift case captions = 2
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                  The text track contains descriptions, a textual description of the video. DeclarationSwift case description = 3
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                  The text track contains chapter titles suitable for navigating the media resource. DeclarationSwift case chapters = 4
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                  The text track contains metadata. Remark This track will not serve display purposes.DeclarationSwift case metadata = 5
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                  The raw value of type String. DeclarationSwift public var _rawValue: String { get set }
