Yes you can! This official guide on using Admob in Libgdx has all you need help you display custom views. Though it focuses on integrating Admob ads, you can use the mechanism to create and display views on top of the OpenGL Surface. For example this is how you'd display a text view on top of your android game's surface view:
@Override public void onCreate (Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// Create the layout
RelativeLayout layout = new RelativeLayout(this);
// Do the stuff that initialize() would do for you
requestWindowFeature(Window.FEATURE_NO_TITLE);
getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
WindowManager.LayoutParams.FLAG_FULLSCREEN);
getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FORCE_NOT_FULLSCREEN);
// Create the libgdx View
View gameView = initializeForView(new HelloWorld(this), false);
// Create and setup the TextView
TextView helloText = new TextView(this);
// Add the libgdx view
layout.addView(gameView);
// Add the TextView
RelativeLayout.LayoutParams textViewParams =
new RelativeLayout.LayoutParams(RelativeLayout.LayoutParams.WRAP_CONTENT,
RelativeLayout.LayoutParams.WRAP_CONTENT);
textViewParams.addRule(RelativeLayout.ALIGN_PARENT_TOP);
textViewParams.addRule(RelativeLayout.ALIGN_PARENT_RIGHT);
layout.addView(helloText, textViewParams);
// Hook it all up
setContentView(layout);
}