If the video output is too bright when you are using Linear color space in the Unity Project Setting, please refer to this documentation: Custom Shaders for Linear Color Space.
Select the GameObject where you render the video. In the Inspector window, set the Y Scale with negative value of the original value.
Use HISPlayer360Shader.shader and attach it to the material. Make sure that the Flip Vertically option is enabled.
If your project requires Target API Level higher than 34 such as 35, then you can select the higher Target API Level and ignore the error message in the HISPlayer settings window.