Instagram is constantly updating its app for users and if you are an instagram freak, you’ll love the upcoming feature. It simply means that all the messenger apps are just copying themselves since the upcoming feature is already present onWhatsAppandFacebook.
Instagram team is internally working on implementing video call possibility to other users. It will work the way WhatsApp video calling works… A new icon will appear in the navigation bar in the chat, as it happens in WhatsApp :
The feature will be immediately accessible once the user opens an active chatwith another

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http://infocity.com.ng/2018/01/instagram-to-implement-video-calling-feature-for-all-users.html