https://www.cnet.com/news/galaxy-note-8-samsung-advertisements-dual-camera/

The Note 8 is rumored to be Samsung's first dual-camera phone, an important addition in a landscape where dual cameras are all but a given for premium phones. Samsung would be one of the last major handset makers to add a two-lens system, along with Google's Pixel refresh. LG, Apple, Huawei, Motorola, Asus and even up-and-comer OnePlus already sell phones with two lenses. The two cameras are useful for portrait mode, for adding extra detail to pictures and have implications for more accurate augmented reality.

In Samsung's video, a woman holds both of her hands to form binoculars in front of her eyes, before the video cuts to the person she's looking at and blurs the people in the background. This is a direct reference to the bokeh effect, which Apple popularized on phones with Portrait Mode on the dual-camera iPhone 7 Plus -- it focuses on a subject while artfully blurring out the background.