[maikito26]

Hi.
I use RP2 for openelec 7.0.1.
I want to start all camera script automatically after booting?
Do you need autostart.sh?
If so, what and how?

 Probably.  The add-on itself doesn't support this feature.  Its a good feature request though and wouldn't be that difficult to implement.   Your startup script would need to call the plugin: plugin.video.surveillanceroom?action=all_cameras likely through the JSON RPC api.