From the video it looks like they're just preventing face detection (probably using OpenCVs implementation of Viola Jones), though i don't think an actual recog

From the video it looks like they're just preventing face detection (probably using OpenCVs implementation of Viola Jones), though i don't think an actual recognition system would do much better when provided a picture of you with lights shining in the middle of your face. For most systems, a combination of a hat, scarf, and sunglasses will work just fine (but keep in mind, if the system uses NIR sensors then sunglasses won't work - they only block UV light).