This device is called supported facial recognition features similar to Apple Face ID on iPhone X, and is expected to be supported by Qualcomm Snapdragon 845.
Xiaomi Mi 8 is expected to be supported with 8GB of RAM, 64GB of internal storage space, as well as wireless charging technology and 4,000 mAh battery. In addition, Mi 8 is reportedly going to use Xiaomi's latest interface technology, MIUI 9.
Unfortunately, the video is only a very long duration of three seconds. It is considered less able to prove that the video properly displays biometric reader technology on Xiaomi Mi 8.
Xiaomi is expected to announce the Mi 8 at the end of this month, alongside the third generation Mi Band device. Meanwhile, in the last week, the image that claims to feature the front panel of the Mi 8 and retail packaging box is circulating on the internet.