NexPlayer has support for 360° video. This feature doesn't require any specific API or code, as it's entirely implemented in the Unity Editor.
To configure a scene for 360° video, use the simple player configured for Material Override rendering. Then, place the camera inside of a Sphere, where the video will be rendered. Next, add the script Packages > NexPlayer Simple Sample (com.nexplayer.nxplayersimplesample) > NexPlayer > SampleCode > FullFeat > UI > StereoMode.cs to the Sphere game object and set the projection mode to match the content. Finally, to handle the camera rotation, add the script NexPlayer360Controller.cs to the video player game object and set the camera reference.