HTML5 canvas camera - control with code

I'm using the adobe help guide for the camera methods etc... 

https://helpx.adobe.com/animate/user-guide.html/animate/using/working-with-camera-in-animate.ug.html

I'm trying to control the camera via code.

I now want to zoom in on certain words on the stage ie: to give emphasis and make things more dynamic.

I enclose the end snippet of code I am using. It doesn't zoom in.

function addPopup() {
	
	//this.s1_b4.visible=false; -- WARNING - don't put stuff before declaring variables.
	
	var Tania = new lib.popup_Tania();
    Tania.x = 350;
    Tania.y = 450;
	exportRoot.addChild(Tania);
	
	cameraZoom();
}

function cameraZoom() {
	
		var cameraObj = AdobeAn.VirtualCamera.getCamera(exportRoot);
	
		this.cameraObj.setPosition(100,100,100);
	    this.cameraObj.setZoom(200);
		//this.cameraObj.zoomBy(100);
}