There is no real benefit for just viewing the camera feed from SmartThings other than having a single app to do it, the reality is that the D-Link App will do a better Job for this
The real benefit of integrating the camera into ST is that you can then control certain aspects of the camera through ST and related to other events happening within the ST environment (like taking a picture when a motion sensor triggers, or moving the camera to that area on a P&T Camera)
For a basic walk-though of how to install a custom App or Device in the IDE take a look at this post:
https://community.smartthings.com/t/faq-an-overview-of-using-custom-code-in-smartthings/16772