documentclass{beamer}
usetheme{Madrid}

begin{document}
begin{frame}{Overview}
  only<1>{
    tableofcontents[sections={1}]
    tableofcontents[sections={2-5},sectionstyle=shaded,subsectionstyle=shaded]
  }
  only<2>{
    tableofcontents[sections={1},sectionstyle=shaded,subsectionstyle=shaded]
    tableofcontents[sections={2}]
    tableofcontents[sections={3-5},sectionstyle=shaded,subsectionstyle=shaded]
  }
  only<3>{
    tableofcontents[sections={1,2},sectionstyle=shaded,subsectionstyle=shaded]
    tableofcontents[sections={3}]
    tableofcontents[sections={4-5},sectionstyle=shaded,subsectionstyle=shaded]
  }
  only<4>{
    tableofcontents[sections={1-3},sectionstyle=shaded,subsectionstyle=shaded]
    tableofcontents[sections={4}]
    tableofcontents[sections={5},sectionstyle=shaded,subsectionstyle=shaded]
  }
  only<5>{
    tableofcontents[sections={1-4},sectionstyle=shaded,subsectionstyle=shaded]
    tableofcontents[sections={5}]
  }
end{frame}

section{Section 1}
begin{frame}{Frame 1}
end{frame}

section{Section 2}
begin{frame}{Frame 2}
end{frame}

section{Section 3}
begin{frame}{Frame 3}
end{frame}

section{Section 4}
begin{frame}{Frame 4}
end{frame}

section{Section 5}
begin{frame}{Frame 5}
end{frame}

end{document}

begin{frame}
titlepage
end{frame}

begin{frame}
frametitle{Plan}
tableofcontents[pausesections]
end{frame}

AtBeginSection[]{

begin{frame}
frametitle{Plan}
tableofcontents[currentsection]
end{frame}}

documentclass{beamer}
usetheme{Madrid}
newcommandtocforsect[2]{%
  begingroup
  edefsafesection{thesection}
  setcounter{section}{#1}
  tableofcontents[#2,currentsection]
  setcounter{section}{safesection}
  endgroup
}
begin{document}
begin{frame}{Overview}
  only<1>{tocforsect{1}{sectionstyle=shaded,subsectionstyle=shaded}}
  only<2>{tocforsect{2}{sectionstyle=shaded,subsectionstyle=shaded}}
  only<3>{tocforsect{3}{sectionstyle=shaded,subsectionstyle=shaded}}
  only<4>{tocforsect{4}{sectionstyle=shaded,subsectionstyle=shaded}}
  only<5>{tocforsect{5}{sectionstyle=shaded,subsectionstyle=shaded}}
end{frame}
section{Section 1}
begin{frame}{Frame 1}
end{frame}

section{Section 2}
begin{frame}{Frame 2}
end{frame}

section{Section 3}
begin{frame}{Frame 3}
end{frame}

section{Section 4}
begin{frame}{Frame 4}
end{frame}

section{Section 5}
begin{frame}{Frame 5}
end{frame}

end{document}

setbeamercovered{transparent}% see beamer documentation p 190
beamerdefaultoverlayspecification{<+>}% see beamer documentation p 89

documentclass{beamer}
usetheme{Madrid}

newcommand{mypause}[1][+]{onslide<#1>}
begin{document}
begin{frame}{Overview}
    setbeamercovered{transparent}% doc p 190
    letpausemypause
    tableofcontents[pausesections]
end{frame}

section{Section 1}
begin{frame}{Frame 1}
end{frame}

section{Section 2}
begin{frame}{Frame 2}
end{frame}

section{Section 3}
begin{frame}{Frame 3}
end{frame}

section{Section 4}
begin{frame}{Frame 4}
end{frame}

section{Section 5}
begin{frame}{Frame 5}
end{frame}

end{document}

documentclass{beamer}
usetheme{Madrid}

begin{document}
begin{frame}{Contents}
tableofcontents
end{frame}

section{Section 1}
tableofcontents[currentsection]
begin{frame}{Frame 1.1}
end{frame}
begin{frame}{Frame 1.2}
end{frame}
begin{frame}{Frame 1.3}
end{frame}
section{Section 2}
tableofcontents[currentsection]
begin{frame}{Frame 2.1}
end{frame}
begin{frame}{Frame 2.2}
end{frame}
begin{frame}{Frame 2.3}
end{frame}
section{Section 3}
tableofcontents[currentsection]
begin{frame}{Frame 3.1}
end{frame}
begin{frame}{Frame 3.2}
end{frame}
begin{frame}{Frame 3.3}
end{frame}
section{Section 4}
tableofcontents[currentsection]
begin{frame}{Frame 4.1}
end{frame}
begin{frame}{Frame 4.2}
end{frame}
begin{frame}{Frame 4.3}
end{frame}
section{Section 5}
tableofcontents[currentsection]
begin{frame}{Frame 5.1}
end{frame}
begin{frame}{Frame 5.2}
end{frame}
begin{frame}{Frame 5.3}
end{frame}
end{document}