@dimpi45 It is very possible. However, keep in mind that prior to identifying faces, the mirror needs to learn/train each kid’s face. This requires taking around 20-50 images (the range is different for each face) of every child which could be a nuisance. I love the idea though!
As far as coding goes, @paviro 's Face Recognition Module does pretty much everything. It detects a face and then ‘logs’ you in the mirror. From there, you can simply have a count for each kid.
Hoping that helps.