Can anyone help me with the JS code for PHP chunk upload

I m trying to upload large files using chunk upload. Gone through a few stack queries and found this code, However, it works perfectly fine for files below 200mb but when I try to upload say 2GB file, it returns This site can’t be reached - Connection was reset error page.

I know I missed the JS part which I couldn't able to figure it out.

HTML goes as :

<form action="upload.php" method="post" enctype="multipart/form-data">
<label>Upload Full Video</label>
      <span class="pure-form-message"> * required</span>
      <input type="file" name="video" class="file_multi_video"   accept="video/*" id="stacked-email" style="width:60%;" placeholder="" />
</form>

Upload.php

set_time_limit(0);
$file2=($_FILES['video']['name']);

$tmpfile = $_FILES['file']['tmp_name'];
$orig_file_size = filesize($tmpfile);
$target_file = 'images/videos/'. $_FILES['video']['name'];
    $chunk_size = 100; // chunk in bytes
    $upload_start = 0;
    $handle = fopen($tmpfile, "rb");
    $fp = fopen($target_file, 'w');
    while($upload_start < $orig_file_size) {
    $contents = fread($handle, $chunk_size);
    fwrite($fp, $contents);

    $upload_start += strlen($contents);
    fseek($handle, $upload_start);
}
    fclose($handle);
    fclose($fp);
    unlink($_FILES['file']['tmp_name']);

.htaccess

RewriteEngine On
RewriteCond %{REQUEST_FILENAME} !-f
RewriteRule ^([^\.]+)$ $1.php [NC,L]

php_value memory_limit 500M
php_value post_max_size 1000M
php_value upload_max_filesize 500M

Please help me out with the JS code for the above php chunk upload.

Any help is greatly appreciated.

from Can anyone help me with the JS code for PHP chunk upload