In most cases people use Contact Form 7 for communication with the site owner, but in this tutorial we will use it to allow our visitors to send video links, that will be easily published in WP Tube 2 theme (works also on other themes).
I will continue the tutorial assuming you already installed Contact Form 7

2. Contact Form 7 – Code

In Contact Form 7 click “Add New” and name the form

 WPTube2 User Videos

In the mail settings change the second row from [your-name] <[your-email]> to any email you like since this form will not be sending any mail. Next copy the code bellow and replace the existing code the form box.

<strong>Video Title:</strong> <em><small>( e.g: Michael Jackson - Beat It )</small> </em>
&#91;text* wpt2-post-title 48/100&#93;

<strong>Video Link:</strong>
<em><small>( e.g: http://www.youtube.com/watch?v=Ym0hZG-zNOk )</small></em>
&#91;text* wpt2-video-link 48/100&#93;

[submit id:submit "Send Video"]

<em>Supported Video Sources: YouTube, Vimeo, DailyMotion, blip.tv, Viddler, Hulu, Qik, Revision3, funnyordie.com</em>

The final form should look like the image bellow!

3. Function for creating post draft from form

If you are using WP Tube 2 just copy the code bellow put it in a text file and rename that to whateveryouwant.php and upload it to themes/wptube2/plugins folder.
For other WP Tube version you need to edit functions.php and add the code bellow at the end of the form(remember to delete the ?php row)!

<!--?php // Function to create Post Draft from Form function jrweb_wpcf7_save($cfdata) { 	$formtitle = $cfdata--->title; // Get the form title from Contact Form 7
	$formdata = $cfdata->posted_data; // Data That will be posted on the form
	if ($formtitle == 'WPTube2 User Videos') {
		$cfdata->skip_mail = true; // true = will not send any mail when user submits links

		// access data from the submitted form

		$post_title = $formdata['wpt2-post-title']; //This is the post title
		$post_content = '' . $formdata['wpt2-video-link'] . ''; // Post Content
		preg_match_all('/[a-zA-Z0-9]{3,}/', $post_title, $matches); // Create tags from post title
		$comma_separated = implode(",", $matches[0]);

		// create a new post

		$newpost = array(
			'post_title' => $post_title,
			'post_content' => $post_content,
			'tags_input' => array(
				$comma_separated
			) ,
			'post_status' => 'draft'
		);
		$newpostid = wp_insert_post($newpost);
	}
}

add_action('wpcf7_before_send_mail', 'jrweb_wpcf7_save', 1);

4. Showing the form in a page or text widget

Now you have completed all the necessary steps just need to show the form in you site. I personally use the wordpress text widget because it is always visible for visitors.
Copy the shortcode for your form and paste it into your post, page or text widget content. In my case the Text widget would look like the image bellow:

If you were looking for the best WordPress video theme WP Tube 2 is the one. It includes all necessary plugins and options to create a Youtube look-alike web site in less than ten minutes.
With Custom Video Publishing plugin that supports more than 50 video sites you can easily publish videos in seconds.

WP Tube 2 saves thumbnails from over 30 different Video hosting sites to your server and adds them to video-posts automaticaly.
Back panel options included in WP Tube 2 make your theme unique by changing the colors and styling it your way!

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Add this code where you want the thumbnails to appear

Add this code to functions.php

// Gets the first uploaded image AND/OR first inserted image into post 
function get_thumb_first_post_image($post,&$thumb_url) {
	//Get images attached to the post   
	$args = array(   
  	'post_type' => 'attachment',   
   	'post_mime_type' => 'image',   
   	'numberposts' => -1,   
   	'order' => 'ASC',   
   	'post_status' => null,   
   	'post_parent' => $post->ID);   
	$attachments = get_posts($args);   
	if ($attachments) {   
   		foreach ($attachments as $attachment) {   
       	$thumb_url = wp_get_attachment_thumb_url( $attachment->ID );   
                return 1;  
		 }   
	}
} 
// This Prints an image when there is no img in the post 
//Note:you can change the path to your images folder
function get_thumb_no_image($post,&$thumb_url) {
	$content = $post->post_content;
	$thumb_url = get_template_directory_uri() . '/images/thumb_noimage.jpg';
	return 1;
}
// Generates the image with link to the post 
//Note:Change the width and height to your needs
function get_post_thumb($url,$title,$img) {
	return '';
}
// Prints the generated images into theme
function print_post_thumb($post) {
		get_thumb_first_post_image($post,$thumb_url)
	 ||	get_thumb_no_image($post,$thumb_url);
	echo get_post_thumb(get_permalink($post->ID), $post->post_title,
					$thumb_url);
}