I watched this video:
I am not sure if this has an update. I see a control (I am sorry to say the video is not of good quality as it is hard to see objects on the UI) which perhaps is Media Item used to link the web service. I do not find this in the User interface of App Designer. Has it been removed and no longer exists?
We will work towards improving our tutorial's video quality. The tutorial uses framework 7's media item widget. If you create an app designer project and choose 'framework 7', it will show up in the List Block section. Also, once a service method binding has been created it is available for use in most of the relevant app designer widgets so even if you don't want to use that framework you can make it work with variations/combinations of other widgets.