See: http://www.gotoandlearn.com/play.php?id=114 Loads the video in at runtime rather than from a SWC.

Playvideo.as

package {
	import com.transmote.flar.FLARManager;
	import com.transmote.flar.marker.FLARMarker;
	import com.transmote.flar.marker.FLARMarkerEvent;

	import flash.display.Sprite;
	import flash.events.Event;
	import flash.media.Video;

	import org.libspark.flartoolkit.support.pv3d.FLARCamera3D;
	import org.papervision3d.objects.primitives.Plane;
	import org.papervision3d.render.LazyRenderEngine;
	import org.papervision3d.scenes.Scene3D;
	import org.papervision3d.view.Viewport3D;


	[SWF(width='640', height='480', backgroundColor='#000000', frameRate='40')]

	public class Playvideo extends Sprite
	{
		private var fm:FLARManager;
		private var scene:Scene3D
		private var view:Viewport3D;
		private var view:FLARCamera3D;
		private var lre:LazyRenderEngine;
		private var p:Plane;
		private var marker:FLARMarker;

		// Video loading
		private var video:Video;
		private var connection:NetConnection;
		private var stream:NetStream;

		public function Playvideo()
		{
			initFLAR();
			
			initVideo("externalVideo.flv"); // <-- Change the filename here!
		}
		
		private function initVideo(videoName:String):void
		{	  
			video = new Video(320, 480); // Size will be changed later
			addChild(video);
			
			connection = new NetConnection();
			connection.connect(null);
			stream = new NetStream(connection);
			stream.client = {onMetaData: metadataHandler};
			
			video.attachNetStream(stream);
			
			// Load the video
			stream.play(videoName);
			
			// Don't play the video immediately
			stopVideo();
		}
		private function stopVideo():void
		{
			stream.pause();
			stream.seek(0);
		}
		private function playVideo():void
		{
			stream.resume();
		}
		private function pauseVideo():void
		{
			stream.pause();
		}
		private function metadataHandler(metadataObj:Object):void 
		{
			video.width = metadataObj.width; 
			video.height = metadataObj.height;
		}
		
		private function initFLAR():void
		{
			fm = new FLARManager("flarConfig.xml");
			fm.addEventListener(FLARMarkerEvent.MARKER_ADDED, onAdded);
			fm.addEventListener(FLARMarkerEvent.MARKER_REMOVED, onRemoved);
			fm.addEventListener(EVENT.INIT, init3D);
			addChild(Sprite(fm.flarSource));
		}
		private function onAdded(e:FLARMarkerEvent):void
		{
			marker=e.marker;
			playVideo();
		}
		private function onRemoved(e:FLARMarkerEvent):void
		{
			marker=null;
			stopVideo();
			
			// If you prefer, you can pause the video rather than reset it to the beginning
			//pauseVideo();
		}
		private function init3D(e:Event):void
		{
			scene= new Scene3D();
			camera= new FLARCamera3D(fm.cameraParams);
			camera.z=-30;
			view= new Viewport3D(640, 480, true);
			lre= new LazyRenderEngine(Scene, camera, view);
		}
	}
}