MediaTrackList
public protocol MediaTrackList : EventDispatcherProtocolA MediaTrackList lists all available MediaTrack objects that the player can play. It contains MediaTrack objects, which are either AudioTracks or VideoTracks.
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                  The number of media tracks in the list of media tracks. DeclarationSwift var count: Int { get }
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                  Returns the MediaTrack object representing the media track at the index position in the player’s list of audio or video tracks. DeclarationSwift func get(_ index: Int) -> MediaTrackParametersindexPosition of the returned MediaTrack. Return ValueThe MediaTrack at the index position. 
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                  Returns the MediaTrack object representing the media track at the index position in the player’s list of audio or video tracks. DeclarationSwift subscript(index: Int) -> MediaTrack { get }ParametersindexPosition of the returned MediaTrack. Return ValueThe MediaTrack at the index position. 
