MediaTrack
public protocol MediaTrack : TrackA MediaTrack is an element that represents a single video or audio track that can be played by the player.
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                  Indicates whether the track is enabled. Remark Options are:- true: The track will be enabled. If another track was currently enabled, that track will be disabled and the player will switch to this track.
- false: The track will be disabled. Given that only one track can be active, this means no audio/video will be played.
 DeclarationSwift var enabled: Bool { get set }
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                  Returns the bandwidth of the media track’s current active quality. Remark The value of this property changes when the media track’s active quality changes.DeclarationSwift var activeQualityBandwidth: Int { get }
