You can use a green-screen. However, remember that there are some restrictions around the place of streaming, such as public places.
Also, remember that if you're going to use a green-screen video, there shouldn't be people visible that are not added to your account as models.
With these two, you're safe. You can have a background with a garden, for example, but if you want to have anything that will look like a public place (even on the green screen and without people), it will be safer to ask the support via email first.