Obligatory IANAL, but I don't think this act applies here. BIPA (http://www.ilga.gov/legislation/publicacts/95/095-0994.htm) defines a "Biometric identifier" as follows:
"Biometric identifier" means a retina or iris scan, fingerprint, voiceprint, or scan of hand or face geometry. Biometric identifiers do not include writing samples, written signatures, photographs, ...
Faceprints are not explicitly part of this. They are approximate representations of faces for tagging, but this act seems geared toward more detailed scans needed to (say) unlock a phone.
If capturing multiple frames of a person's face constitutes a biometric, then that could render security cameras and recording video in public illegal.