#!/bin/bash
videos[0]=$HOME/Videos/a_video.mp4
videos[1]=$HOME/Videos/another_video.mp4
videos[2]=$HOME/Videos/as_many_videos_as_you_like.mp4
videos[3]=$HOME/Videos/really.mp4

for video in ${videos[@]}; do
    xdg-open $video ;
    while pgrep -f "$video" >/dev/null ; do
        sleep 1
    done
done