Quick and dirty script to provide an API that would show the

video-list-api.php

<?php

header('Content-Type: application/json');
header('Access-Control-Allow-Origin: *'); 

$files = scandir('.');
$videos = array_filter($files, function($filename) {
	return strpos($filename, 'VID') !== false  && strpos($filename, '-thumbnail') === false;
});

$json = [];

foreach($videos as $video) {
	$json[] = [
		'videoUrl' => $video,
		'thumbnailUrl' => $video . '-thumbnail.jpg'
	];
}


echo json_encode($json);


/** Example Response:
* [
    {
        "videoUrl": "VID_1415583006.mp4",
        "thumbnailUrl": "VID_1415583006.mp4-thumbnail.jpg"
    },
    {
        "videoUrl": "VID_1415592608.mp4",
        "thumbnailUrl": "VID_1415592608.mp4-thumbnail.jpg"
    }
]
*/