requestCameraPermission static method 
    
    
    
  Implementation
  static Future<Map<String, bool>> requestCameraPermission() async {
  String camera = 'Camera';
  if(kIsWeb){
    return {camera: true};
  }else{
  try {
    PermissionStatus status = await Permission.camera.status;
    if (status == PermissionStatus.granted) {
      // Camera permission is already granted
      return {camera: true};
    } else if (status == PermissionStatus.denied) {
      // Camera permission is denied, request it
      PermissionStatus newStatus = await Permission.camera.request();
      return newStatus == PermissionStatus.granted
          ? {camera: true}
          : {camera: false};
    }
  } catch (e) {}
  return {camera: false};}
}