with the help of an AnimationPlayer you can animate 3D nodes trough manipulating their properties (position, rotation, scale, color, ...) and add the new values with key-frames to the animation.
Here are some Tutorial's from the documentation. There is a demo with the features which are used by the animation player in Godot. This can be used in 2D and 3D scenes.
You can create with that animations like in-game-cutszenes, but I think you can not export or render these animations as 'video's' to watch it in an external video-player.