You can video chat with up to 8 people using messaging on Instagram.
Starting a video chat
To begin a video call on Instagram:
Instagram app for Android and iPhone
Tap or in the top right of Feed.
Tap in the top right.
Select people from the list below or tap Search... to search for someone, then tap Start.
The person or group you call will receive a notification that you're calling them.
Keep in mind that anyone you've accepted a message from, except for verified accounts, can video chat with you. To prevent someone from video chatting with you, you can block them.
Managing a video chat
While on a video call you can:
Add people. Tap to add someone to your video call. The people you've added will receive a notification that you're calling them.
Switch cameras. Tap at the top or tap your video twice to switch between the front or back-facing camera.
Browse Instagram. Tap to make your video chat appear in a small frame on your device. You can continue to use Instagram as you usually would.
End a video call. Tap in the top right to end your video chat.