If you have any additional questions, don't hesitate to contact me on my stream or via this forum, I'm always glad to help. There are a ton of tutorials on youtube on how to use it. If you wish to show only one of the two images, what you would want to do is run two separate instances of OBS and run one of them in full screen preview mode and use the other to capture half of the preview footage (make sure you set it to 1080p so you don't lose quality). Much like shadowplay it can record and directly stream your game and has a lot of functionality to make things look great. ShadowPlay uses the NVENC, which is a small part on the graphics chip of your 1060, which is just there to encode videos. You don't have to rotate anything as it mirrors game footage directly without the need for screen capture which is coincidentally easier on your resources and keeps full source resolution. Users can record at 60 fps in 4K HDR or 30 fps in 8K HDR.

The software functions as gameplay recording software, allowing users to actively film gaming clips as long as they desire. I would first of advise against using shadowplay and instead simply use a free open source program called OBS. NVIDIA ShadowPlay makes it simple to capture and share top-quality snapshots, live broadcasts, and recordings with ones peers. Look at my past footage (please follow) of my twitch stream for examples: I think I can help you out a little here.

Obs or nvidia shadowplay