This setup assumes, you have installed the latest FlytOS image available in https://my.flytbase.com/downloads/flytos/. No need to update your image if you downloaded it after 12th June 2017.
Now, to get raspi cam enabled, run the following command:
$ sudo apt-get update
$ sudo apt-get upgrade
$ sudo raspi-config
In raspi-config window, enable camera from Interfacing Options. Once done, reboot your device.
Tada. your camera should be enabled now. Future FlytOS images, would have enabled camera support by default.
It would be better if you also upgrade your kernel, by running this command:
$ sudo rpi-update
Once, done reboot your device. Be patient, as it takes some time to boot up for the first time.
Once your device boots up, wait for around a minute and open up flytconsole to check video streaming.
EDIT: To configure camera capture options such as framerate, resolution etc., open up /flyt/flytos/flytcore/share/vision_apps/launch/cam_api.launch, and edit accordingly.