How do I attach camera to Spark.components.VideoDisplay

I'm using Flash Builder and created a spark-application Flex project that will stream video from the local camera. If I use mx.controls.VideoDisplay; there is no problem since it has attachCamera(camera) method. But Spark's VideoDisplay component does not have that method. I know I can use mx controls inside a Spark app but I want to know:

• What is the real difference between spark.components.VideoDisplay and mx.controls.VideoDisplay?
• How do I attach camera to spark.components.VideoDisplay?
• Is there any advantages if I go with spark (since it's newer to mx library)?

thanks.

EDIT: In the documentation this is mentioned: "Starting with Flex 4.0, Adobe recommends that you use the spark.components.VideoPlayer class as an alternative to this class. (mx.controls.VideoDisplay)"

Here are the specifics to get this working:

import mx.events.FlexEvent;

import org.osmf.net.StreamType;

import spark.components.mediaClasses.DynamicStreamingVideoItem;
import spark.components.mediaClasses.DynamicStreamingVideoSource;

private var _cam:DynamicStreamingVideoSource =  new DynamicStreamingVideoSource();
private var _dynVideoSource:DynamicStreamingVideoSource;

protected function application1_creationCompleteHandler(event:FlexEvent):void
{

    _dynVideoSource=new DynamicStreamingVideoSource();

    var videoItems:Vector.<DynamicStreamingVideoItem>;
    videoItems=new Vector.<DynamicStreamingVideoItem>();
    videoItems[0]=new DynamicStreamingVideoItem();

    _dynVideoSource.host= "";
    _dynVideoSource.streamType=StreamType.LIVE;
    _dynVideoSource.streamItems=videoItems;

    mycam.source=_dynVideoSource;

    var cam:Camera = Camera.getCamera(); //Camera.names[0]);
    cam.setMode(640, 480, 15);
    cam.setQuality(0, 80);
    mycam.videoObject.attachCamera(cam); 
}