.htaccess
#AddDefaultCharset utf-8
#Options +FollowSymLinks
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d

ReWriteRule ^watch(/?)$	watch.php [L,NC]
watch.php
<?php
if(isset($_GET['v'])){
	$v = $_GET['v']; //güvenlikten geçirmeyi unutma
	echo $v;
}
?>