Now if a user says “Hey Google, video call Mom,” up pops Google Duo — as long as the app is installed.
Google Duo, first announced in 2016, is a video chat app — much like Apple’s FaceTime — however, it’s available for both Android and iOS. It has a few features that can’t be found on its rival’s app, such as the ability to leave video messages rather than voicemails, preview the caller’s live camera before answering and it’s also not necessary for both parties to have the app.
http://www.freemalaysiatoday.com/category/leisure/2018/07/25/users-can-now-ask-google-assistant-to-video-call-on-duo/