The idea is that phones have very nice cameras and lot of media processing power and such API could enable hackers to easily incorporate capable camera stack in to their projects without android development experience in any language they like.
There are millions of working phones in the drawers battery backed, with plenty of computing power, nice cameras, hardware acceleration, good connectivity (WiFi, ethernet over usb), that could get new purpose.
Previously I was working on automated photogrammetry rig and this is perfect use case for that.
If you see other use case for such API share your ideas.
If you think that's cool idea to develop and would like to help write me at hn@zelo.pl