You can do the same with just an internet audio call by using that button instead.
IMO provides great support for group video chat as well.
Note: Nobody can make a video or audio call with IMO unless they've both added each other as contacts. To start a one-to-one video chat, simply tap on your friend's name to initiate a call.
Once they answer, you'll see a video of them, as well as a video of yourself in the upper left corner.
IMO is available for mobile devices as well as Windows computers.