Using media9 to include videos files

              
\documentclass[12pt,a4paper]{article}
\usepackage[utf8]{inputenc}
\usepackage[T1]{fontenc}
\usepackage{parskip}

\usepackage{graphicx}
\usepackage{media9}
\title{Using media9 to include videos files}
\begin{document}

Videos don't play on Overleaf! Download the PDF and open in Acrobat Reader to view. :-)

This is an .mp4 file:

% using a .mp4
\includemedia[width=0.6\linewidth,height=0.6\linewidth,activate=pageopen,
passcontext,
transparent,
addresource=penguinschasingbutterfly.mp4,
flashvars={source=penguinschasingbutterfly.mp4}
]{\includegraphics[width=0.6\linewidth]{penguins}}{VPlayer.swf}

This is a YouTube video (needs an Internet connection to view):

% using a YouTube video
\includemedia[
  width=0.6\linewidth,height=0.3375\linewidth,
  activate=pageopen,
  flashvars={
  modestbranding=1 % no YT logo in control bar
  &autohide=1 % controlbar autohide
  &showinfo=0 % no title and other info before start
  &rel=0 % no related videos after end
}
]{\includegraphics[width=0.6\linewidth]{048}}{https://www.youtube.com/v/g8Ejj0T0yG4?rel=0}
\end{document}