Please, please, find an actual filmmaker to make your demo videos.<p>Being able to program the editor doesn't make you a good user of the editor.<p>You'll likely also get very valuable feedback from the process of making those videos.
Also the client is fully open-source, so you can check out the code here-
<a href="https://github.com/pRoy24/samsar">https://github.com/pRoy24/samsar</a>