documentclass[a4paper]{scrbook}
usepackage{tikz}
usepackage{xcolor}
definecolor{ocre}{RGB}{243,102,25}

begin{document}

begin{tikzpicture}[remember picture,overlay]
  node at (current page.north west)
  {begin{tikzpicture}[remember picture,overlay]
    node[anchor=north west,inner sep=0pt] at (0,0) {includegraphics[width=paperwidth]{pic}};
    draw[anchor=west] (5cm,-9cm) node [line width=2pt,rounded corners=15pt,draw=ocre,fill=white,fill opacity=0.5,inner sep=15pt]{strutmakebox[13cm]{}};
    draw[anchor=west] (5.3cm,-9.1cm) node {hugesffamilybfseriescolor{black}1. Title of a Chapterstrut};
  end{tikzpicture}};
end{tikzpicture}
vspace*{10cm}

Content of the chapter.

end{document}