With the new initiative, Android phone users will now be able to make video calls directly from were their call or message. It's one of Google's many messaging apps: Android Messages, Allo, Duo, Hangouts Chat, and Hangouts Meet - YouTube even got a chat feature recently. "You can now start a video call directly from where you call or text message your friends, through your Phone, Contacts, and Android Messages apps".
Google Duo's video-calling feature will be integrated into the Phone, Contacts and the Messaging apps on Android system, according to a new post from Google. Google's new Pixel launcher (the extra software that comes on top of Android 8.0 Oreo) puts reminders for upcoming events right on your homescreen, which is pretty great if you're the type of person who constantly forgets about scheduled plans and meetings.
The newly integrated Video calling facility to the will be available for first-generation Pixel, Android One, and Nexus device users for the time being. It scans every app before you install it. Earlier this year Google Duo added support for the voice call. If not, Duo will connect you to anyone with the app installed. That apart the whole ViLTE compatibility thing is unclear since both the caller and the receiver needs to be on a carrier that supports ViLTE.
From within the phone app, you'll be able to initiate a video call from the call history or search. ViLTE stands for video over LTE and is an extension of VoLTE.