CropGridViewer.preview constructor
      const
      CropGridViewer.preview({ 
    
- Key? key,
- required VideoEditorController controller,
It is the viewer that allows you to crop the video
Implementation
const CropGridViewer.preview({
  super.key,
  required this.controller,
})  : showGrid = false,
      rotateCropArea = true,
      margin = EdgeInsets.zero;