Hi,
As usually with plugins integrating inside the core app is totally obvious. If it is currently separated apk there is actually good reasons and it's not because it's complicate to re-integrate a plugin into the core app : it's only about not dispacthing the native lib, adding good things to the manifest and having the plugin's broadcast receiver inside the core app. This process is the same for all csipsimple plugins (audio codecs/video codecs/video feature). (you can have a look to commit that integrated in the past audio codecs that became stable).
If the video feature is currently outside it's because :
* not yet stable/finalized => you should focus on that if you want to contribute on this topic
* adds extra size on the package for a feature not needed by anyone : remember that there is still people using old device with limitate storage space