You can get the list of all attached webcams in flash in an array like this

var arrCam:Array = Camera.names;

Below code you can use to display video from your webcam in Flash Builder/ Flex.

<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute" minWidth="1024" minHeight="768" applicationComplete="attachvideo()">
	<mx:Script>
		<![CDATA[
			var askCam = Camera.getCamera();
			private function attachvideo():void{
			var askVid:Video = new Video(askCam.width, askCam.height);
			askVid.x = 10;
			askVid.y = 10;
			askVid.attachCamera(askCam);
			rawChildren.addChild(askVid);  
			}
		]]>
</mx:Script>
</mx:Application>

To display multiple cams you just need to add more video components and attach the camera like this :

Instead of using "var askCam = Camera.getCamera();" which gives you default camera.You get array of cameras and use it like this

Suppose you have 3 cams

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	var askCam1 = Camera.getCamera(arrayOfCams[0]); 
	var askCam1 = Camera.getCamera(arrayOfCams[1]); 
	var askCam1 = Camera.getCamera(arrayOfCams[2]); 

hi
thank you so mutch for the reply :D
Ok I'll be back after my test
In french:
Salut
Merci beaucoup pour les réponses
d'accord je reviens après mes testes

Ok
great :D