Natural and diffused light (e.g., sunlight through a translucent window shade, or under a tree that has a large canopy of leaves) work great for selfie videos.
It is often good to position your face at roughly 45 degrees from your light source, so you can create a gentle shadow on one side of your face.
When possible, recording in the early morning or late afternoon/early evening, will offer a softer and more flattering natural light.
Pay attention to dramatic disparities in the light in different parts of your shot, and adjust your shot as needed:
(i.e., You may think it's a good idea to shoot a selfie video with your back right up against a bright window, but it's possible that your face may end up being very dark and underexposed, and the window may being overexposed and way too bright)
Watch out for glare in glasses, and adjust the position of your head and body if necessary
Here is a Bok Center-produced video that explores lighting considerations for when recording in and around your house:
Here is a Bok Center-produced video that explores lighting considerations for when shooting outside: