Insert image on a existing PDF having content with hexapdf gem

insert_image_on_pdf.rb

require 'hexapdf'

doc = HexaPDF::Document.open("/home/xxxx/Downloads/OoPdfFormExample.pdf")
page = doc.pages[0]
canvas = page.canvas(type: :overlay)


canvas.translate(0, 20) do
  canvas.fill_color(0.3, 0.7, 0.7)
  canvas.rectangle(50, 0, 80, 80, radius: 80)
  canvas.fill

  solid = canvas.graphic_object(:solid_arc, cx: 190, cy: 40, inner_a: 20, inner_b: 15,
                                outer_a: 40, outer_b: 30, start_angle: 10, end_angle: 130)

  canvas.line_width(0.5)
  canvas.opacity(fill_alpha: 0.5, stroke_alpha: 0.2) do  
    canvas.image(File.join(__dir__, 'cloud.png'), at: [350, 0], height: 80)
    canvas.image(File.join(__dir__, 'freepik.jpg'), at: [50, 400], height: 80) 
  end
end

doc.write('/home/xxxx/Downloads/graphics.pdf', optimize: true)