How to use the analytics-events.videoPlaybackStarted function in analytics-events

Pinterest.prototype.getPinterestEvent = function(segmentEvent) {
  for (var mappedEvent in this.options.pinterestEventMapping) {
    if (mappedEvent.toLowerCase() === segmentEvent.toLowerCase()) {
      return this.options.pinterestEventMapping[mappedEvent];
    }
  }

  var eventMap = [
    // Segment Inbound Event (Regex) -> Pinterest Outbound Event
    [analyticsEvents.productsSearched, 'Search'],
    [analyticsEvents.productListFiltered, 'Search'],
    [analyticsEvents.productAdded, 'AddToCart'],
    [analyticsEvents.orderCompleted, 'Checkout'],
    [analyticsEvents.videoPlaybackStarted, 'WatchVideo']
  ];

  for (var index in eventMap) {
    if (!eventMap.hasOwnProperty(index)) continue;
    var eventRegex = eventMap[index][0];
    var pinterestEvent = eventMap[index][1];

    if (eventRegex.test(segmentEvent)) {
      return pinterestEvent;
    }
  }
};