You need: an android phone
- Download this app: https://play.google…jagar.xscamera
- Change 2 settings in this app: a) Make the camera type front b)Make the privacy mode: nothing
- Now click the start camera button and go and browse some other app, like browsing a chat on WhatsApp or a picture in your Gallery
- Finally ask that person to show him this conversation or this photo from your phone screen while the front camera is recording, and this way you will record his/her face without his/her knowledge.