I made a sample php code on http://twitch.apiexampl.es
Specifically http://twitch.apiexampl.es/test.php.txt
In this code the array $channels = array("") can be a comma delimited list of streamers… Then it will find the most popular one of them and embed that stream. As a backup you can set it to play the most popular DayZ stream on twitch if none of your selected channels are available.
I hope this helps you.