Not the same but for a more pro approach and allowing to stream to a RTSP Server I use LARIX Broadcaster, which is both available on android and iOS and it's just superb to turn an old phone into a camera, ofc you'd need an other software to actually detect movement and such from the RTSP feed. Scrypted can do that (for example)

GPS, accellerometors, gsm, battery, usb. A cheap usb breakout board and youre all set. Meanwhile try to by this for your raspi