I don't think hair is usually included in the faked part. Generally for a convincing result you would use a base video of someone who has at least some semblanc

I don't think hair is usually included in the faked part. Generally for a convincing result you would use a base video of someone who has at least some semblance to the target (including hair). It is also possible that hair was disabled to get real-time performance for this (quite impressive) demo.