If your account has been flagged for unusual weight loss activity or if you are playing in a high-stakes game, you will be required to submit a video weigh-in.
Completing a video weigh-in is very similar to completing a photo weigh-in, except that you are required to use a digital scale and will need to have a friend film you. Your video should begin with a full shot of you standing on the scale with your face clearly visible, then zoom into the scale to focus on your weight and the paper with your weigh-in word. You can see a sample video weigh-in here.