I'm not sure what you are asking. You can make a video call to another Verizon customer that also has VoLTE enabled( except for the iPhone 6 and 6 plus ) and they and you are in a 4G area. The video can go over wi-fi but the call has to be over the 4G network.
That's a great question Janet215! The Galaxy S5 is VoLTE capable. Have you done a recent software udpate that includes the setting? To check if you have the most up to date software tap on settings>system updates>check for new software update.
If you have the most up to date software, also ensure the feature code is active on your account.
Follow us on Twitter @VZWSUPPORT