Uploading a video caus $_POST/$_FILES to be empty - php

Question

I am trying to upload the image and video in my project, but when I tried to upload video it returns an empty array for $_POST and $_FILES both.
If I try to upload an image, the same code is working fine. The code I have used is below:
extract($_POST);
$upload_dir = wp_upload_dir();
$target_dir = $upload_dir['basedir'].'/mediauploads/';
$target_file = $target_dir . basename($_FILES["fileToUpload"]["name"]);
if($upd)
{
$imageFileType = pathinfo($target_file,PATHINFO_EXTENSION);
if($imageFileType != "mp4" && $imageFileType != "wmv" && $imageFileType != "avi" && $imageFileType != "mov" && $imageFileType != "3gp" && $imageFileType != "mpeg" && $imageFileType != "jpg")
{
echo "File Format Not Suppoted";
} else {
$video_path=$_FILES['fileToUpload']['name'];
move_uploaded_file($_FILES["fileToUpload"]["tmp_name"],$target_file);
echo "uploaded ";
}
}
Upload video form:
<form method="post" enctype="multipart/form-data">
<table border="1" style="padding:10px">
<tr>
<Td>Upload Video</td>
</tr>
<Tr>
<td><input type="file" name="fileToUpload"/></td>
</tr>
<tr>
<td><input type="submit" value="Uplaod Video" name="upd"/></td>
</tr>
</table>
</form>

Answer 1

if (isset($_FILES["stPic"]["name"]) && $_FILES["stPic"]["tmp_name"] != ""){
$fileName = $_FILES["stPic"]["name"];
$fileTmpLoc = $_FILES["stPic"]["tmp_name"];
$fileType = $_FILES["stPic"]["type"];
$fileSize = $_FILES["stPic"]["size"];
$fileErrorMsg = $_FILES["stPic"]["error"];
if (!preg_match("/.(gif|jpg|png|mp4|3gp|wmw|avi|mkv)$/i", $fileName) ) {
echo "File Format Not Suppoted";
}else{
$moveResult = move_uploaded_file($fileTmpLoc, "video/$fileName");
if ($moveResult != true) {
echo 'file not upload';
exit();
}
else{
//You run sql query
echo 'Uploaded';
}
}
}