My use-case is to detect faces (from continuous stream of input to google glass) I tried using ML Kit but it seems it requires play store which GGE 2 doesn't have
Referring to this Face Detection using Google Glass Enterprise Edition 2 Has anyone find a solution for it?
There are other options that do not require Play Services such as opencv but I wouldn't suggest doing any heavy work on a wearable device like Glass, I think your best option would be to use a remote service, for example Azure