nodelet: can't add argument to constructor

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I am writing a ROS nodelet in which I have a GetInstance() method. I am trying to parse a string argument and it's throwing me the error. Can someone point out how this error can be fixed?? Any help is appreciated.

Following is the build error -

In file included from /opt/ros/noetic/include/class_loader/class_loader_core.hpp:45,
                 from /opt/ros/noetic/include/class_loader/class_loader.hpp:46,
                 from /opt/ros/noetic/include/pluginlib/./class_list_macros.hpp:40,
                 from /opt/ros/noetic/include/pluginlib/class_list_macros.h:35,
                 from /home/robo/test_ws/src/blob_detect/src/blob_detect/blob_detect_nodelet.cpp:3:
/opt/ros/noetic/include/class_loader/meta_object.hpp: In instantiation of ‘B* class_loader::impl::MetaObject<C, B>::create() const [with C = blob_detect::BlobDetectNodelet; B = nodelet::Nodelet]’:
/opt/ros/noetic/include/class_loader/meta_object.hpp:196:7:   required from here
/opt/ros/noetic/include/class_loader/meta_object.hpp:198:12: error: no matching function for call to ‘blob_detect::BlobDetectNodelet::BlobDetectNodelet()’
  198 |     return new C;
      |            ^~~~~
In file included from /home/robo/test_ws/src/blob_detect/src/blob_detect/blob_detect_nodelet.cpp:1:
/home/robo/test_ws/src/blob_detect/include/blob_detect/blob_detect_nodelet.h:22:3: note: candidate: ‘blob_detect::BlobDetectNodelet::BlobDetectNodelet(const string&)’
   22 |   BlobDetectNodelet(const std::string& cameraName) : nodelet::Nodelet() {}
      |   ^~~~~~~~~~~~~~~~~~~~~~
/home/robo/test_ws/src/blob_detect/include/blob_detect/blob_detect_nodelet.h:22:3: note:   candidate expects 1 argument, 0 provided
make[2]: *** [CMakeFiles/blob_detect.dir/build.make:63: CMakeFiles/blob_detect.dir/src/blob_detect/blob_detect_nodelet.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:183: CMakeFiles/blob_detect.dir/all] Error 2
make: *** [Makefile:141: all] Error 2

My blob_detect_nodelet.h file looks like the following -

#ifndef BLOB_DETECT_NODELET_H
#define BLOB_DETECT_NODELET_H

#include <cv_bridge/cv_bridge.h>
#include <ros/ros.h>
#include <sensor_msgs/Image.h>
#include <sensor_msgs/RegionOfInterest.h>
#include <sensor_msgs/image_encodings.h>
#include <boost/geometry.hpp>
#include <boost/range/irange.hpp>
#include <opencv2/opencv.hpp>
#include "nodelet/nodelet.h"

namespace blob_detect {

class BlobDetectNodelet : public nodelet::Nodelet {
 public:
  BlobDetectNodelet(const std::string& cameraName) : nodelet::Nodelet(){}
  static BlobDetectNodelet& GetInstance(const std::string& cameraName = "");
  inline const cv::Mat GetCurrentImage(void) const { return currentImage; }
  inline void SetCurrentImage(const cv::Mat& image) { currentImage = image; }

 private:
  void onInit() override;
  void imageCb(const sensor_msgs::Image::ConstPtr& msg);
  ros::NodeHandle nh;
  ros::NodeHandle private_nh;
  ros::Subscriber imageSub;
  ros::Publisher roiImagePub;
  const std::string cameraName;
  cv::Mat currentImage;

}

And following is my blob_detect_nodelet.cpp file -

#include <blob_detect/blob_detect_nodelet.h>
#include "pluginlib/class_list_macros.h"

namespace blob_detect {
void BlobDetectNodelet::onInit() {
  nh = getNodeHandle();
  private_nh = getPrivateNodeHandle();

  roiImagePub = nh.advertise<sensor_msgs::Image>("/camera_1/output_image", 100);
  imageSub = nh.subscribe("/camera_1/image_raw", 10, &BlobDetectNodelet::imageCb, this);
}

BlobDetectNodelet& BlobDetectNodelet::getInstance(const std::string& cameraName) {
  static BlobDetectNodelet instance(cameraName);
  return instance;
}

void BlobDetectNodelet::imageCb(const sensor_msgs::Image::ConstPtr& image) {
  cv_bridge::CvImageConstPtr cv_image = cv_bridge::toCvShare(image, "mono8");
}
}  // namespace blob_detect

PLUGINLIB_EXPORT_CLASS(blob_detect::BlobDetectNodelet, nodelet::Nodelet);