ImageView is based on a Widget so you should have the same API just as you have to a button.
Create your ImageView using
auto image = ImageView::create(“pngfile.png”);
with image you can do whatever you are used to with widget and Node such as SetPosition and addChild.
image->addTouchEventListener(…) to register for your touch callback. and you are done…
If you don’t understand . search for cocos2dx::ui::Button examples which is exactly the same but instead of a button a static image.