Privacy concerns around facial recognition and object detection - what are my options?

I'm working on a project to build a demo for an application that uses the OpenCV library for facial recognition, object detection, and video tracking. The client is concerned about privacy implications of collecting this information and I'm not sure what options are available to mitigate this.<br><br>I want to make sure I'm complying with privacy laws and regulations, but I'm also unsure how to communicate this to the client or what alternatives I can suggest.