A quick example of how to set up events for a video element that is already in the DOM and thus not created from within GWT.

Player.java

package MyVideoPlayer;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.Map;

import com.google.code.gwt.html5.media.client.VideoElement;
import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Element;

class Player implements EntryPoint {
   private VideoWrapper video;

   @Override
   public void onModuleLoad() {
      exposeJavaScriptAPI();
   }

   public Player(JavaScriptObject element) {
      video = VideoWrapper.wrap(element.<VideoElement> cast());
      bindEvents();
   }

   private native void bindEvents() /*-{
     var instance = this;
     var v = this.@MyVideoPlayer.Player::video.getElement()();
     $wnd.addEventListener("unload", function() { instance.@MyVideoPlayer.Player::onUnload()(); });
     v.addEventListener("click", function() { instance.@MyVideoPlayer.Player::onClick()(); });
     v.addEventListener("touchstart", function() { instance.@MyVideoPlayer.Player::onClick()(); });
     v.addEventListener("ended", function() { instance.@MyVideoPlayer.Player::onEnded()(); });
     v.addEventListener("play", function() { instance.@MyVideoPlayer.Player::onPlay()(); });
     v.addEventListener("pause", function() { instance.@MyVideoPlayer.Player::onPause()(); });
     v.addEventListener("timeupdate", function() { instance.@MyVideoPlayer.Player::onTimeupdate()(); });
     v.addEventListener("loadedmetadata", function() { instance.@MyVideoPlayer.Player::onLoadedmetadata()(); });
     v.addEventListener("durationchange", function() { instance.@MyVideoPlayer.Player::onDurationChange()(); });
   }-*/;

   @SuppressWarnings("unused")
   private void onClick() {
   }

   @SuppressWarnings("unused")
   private void onDurationChange() {
   }

   @SuppressWarnings("unused")
   private void onEnded() {
   }

   @SuppressWarnings("unused")
   private void onLoadedmetadata() {
   }

   @SuppressWarnings("unused")
   private void onPause() {
   }

   @SuppressWarnings("unused")
   private void onPlay() {
   }

   @SuppressWarnings("unused")
   private void onTimeupdate() {
   }

   @SuppressWarnings("unused")
   private void onUnload() {
   }

   protected static native void exposeJavaScriptAPI() /*-{
     $wnd.Player = function(element) {
       this.instance = @MyVideoPlayer.Player::new(Ljava/lang/String;Lcom/google/gwt/core/client/JavaScriptObject;)(element); 
     };
   }-*/;
}

VideoWrapper.java

import com.google.code.gwt.html5.media.client.Media;
import com.google.code.gwt.html5.media.client.VideoElement;
import com.google.gwt.user.client.ui.RootPanel;

class VideoWrapper extends Media {
   private VideoWrapper(VideoElement e) {
      setElement(e);
   }

   /*
    * Needed in GWT 2.0.3 because it kills unknown events. In 2.1 this isn't
    * the case. Any unknown events are sent along.
    */
   @Override
   public void onBrowserEvent(Event event) {
      DomEvent.fireNativeEvent(event, this, this.getElement());
   }

   protected static VideoWrapper wrap(VideoElement e) {
      assert Document.get().getBody().isOrHasChild(e);
      VideoWrapper v = new VideoWrapper(e);
      v.maybeInitMediaEvents();
      // The two lines below seems to be good practice to avoid memory leaks...
      v.onAttach();
      RootPanel.detachOnWindowClose(v);
      return v;
   }
}