SASNativeVideoAd
A SASNativeVideoAd object represents a native video ad programmed in the ad server.
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                    YES if the video ad should autoplay as soon as it is viewable, NO otherwise. DeclarationObjective-C @property (readonly) BOOL autoplay;Swift var autoplay: Bool { get }
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                    The URL of the image that will be used as poster image for the video ad if any, nil otherwise. DeclarationObjective-C @property (strong, readonly, nullable) NSURL *posterImageUrl;Swift var posterImageUrl: URL? { get }
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                    The URL of the image that will be used as background image in interstitial views during ad playback if any, nil otherwise. DeclarationObjective-C @property (strong, readonly, nullable) NSURL *backgroundImageURL;Swift var backgroundImageURL: URL? { get }
