Event to get children view

I have a problem with a component. When I drop a component into the canvas I create a simple object. Before appending this object I need to check if some attribute is already populated but children are not yet available.

view: defaultView.extend( {
	tagName: 'alea-video',
	updateContent() {
		this.el.innerHTML = "";
		this.el.innerHTML = this.model.get('content')
	},    
	init() {
		this.listenTo(this.model, 'change:content', this.updateContent);
	},
	render: function () {
		defaultView.prototype.render.apply(this, arguments);
		var iframe = document.createElement("iframe");
		var value = document.createElement("div");

		value.style.pointerEvents = 'none';
		value.classList.add("video-container");
		if (this.el && this.el.childNodes[0] && this.el.childNodes[0].childNodes[0]) {
			value.appendChild(iframe);
		}				
		return this;
	},
});