Are you wanting to know how to make Video call using the stock phone app on your device?
Hey @Samsung_V7rcVf2 ,
If you purchased a device from your carrier (not unlocked) you should be able to go to any contact and click on the Video Camera Icon. If it's not there you may have an unlocked device.
If you have an unlocked device you could try using the application built into the phone known as Duo (Blue camera application) and that should give you another option of video calling. Then there's always applications like Whatsapp, and Facebook Messenger that also allow video calling.