Outside of off the cuff experiments, most of my Pis are provisioned as MotionEyeOS[0] security cams. Each client can be linked into a central "server" so you can view them all at once, and lots of nice config options for storing or sending image and video either continuously or based on motion. I have the streaming set up so I can peek in from anywhere using VLC on my phone.

[0] https://github.com/ccrisan/motioneyeos/wiki