platform/video.videojs/dist/video.es.js
function markPluginAsActive(player, name) {
  player[PLUGIN_CACHE_KEY] = player[PLUGIN_CACHE_KEY] || {};
  player[PLUGIN_CACHE_KEY][name] = true;
}
function markPluginAsActive(player, name) {
  player[PLUGIN_CACHE_KEY] = player[PLUGIN_CACHE_KEY] || {};
  player[PLUGIN_CACHE_KEY][name] = true;
}
Marks a plugin as "active" on a player.

Also, ensures that the player has an object for tracking active plugins.

@private
@param   {Player} player
A Video.js player instance.

@param   {string} name
The name of a plugin.