The new Nexus 6P has a generous memory, which allows to take very beautiful slow motion videos. Slow motion is possible by the absorption of a large number of frames per second. In the Nexus 6P you can take up to 240 fps (240 fps).
The slow motion arises by playing these video images in a normal speed. With slow motion more details can be included by the increased number of frames per second.
With the Nexus 6P it looks for example like this:
https://www.youtube.com/watch?v=CI3fCFa9X_8
As you can see, you can produce with the Nexus 6P very beautiful slow motion video recordings.