documentclass[12pt]{beamer}
usepackage[T1]{fontenc}
usepackage[utf8]{inputenc}
usepackage{multimedia}
usepackage{tikz}

begin{document}

begin{frame}{Test frame}
begin{tikzpicture}[remember picture,overlay]
node (movie) at (current page.center) {
movie[width =paperwidth, height=0.599paperwidth, poster, autostart, loop]{}{videoTest.mp4}
};
node (test) at (current page.center) {
Content that should appear over the movie
};
end{tikzpicture}
end{frame}

end{document}