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<a href="http://trinitronic.com/wordpress/wordpress-nice-youtube" title="Nice YouTube Plugin Full Version" rel="nofollow ugc">Upgrade to the full version of the Nice YouTube plugin.</a>
Get the easiest and most convenient way to add a YouTube video player to posts, pages and sidebar widgets with Nice YouTube Lite plugin!
Whether you want to display one YouTube video or many YouTube videos, the Nice Youtube Lite plugin makes it easy to turn any WordPress post, page or sidebar widget into a video experience. No need to horse around with complicated embed codes, the Nice Youtube Lite’s implementation is quick, flexible and easy to use. Simply enter the Nice Youtube Lite shortcode where you want your YouTube video player to appear and you’re all set!
Example:
[niceyoutubelite id=”UXtjrb0WBhc”]
Some cool features:
<ul>
<li>Easily add YouTube videos anywhere in a post, page or sidebar widget.</li>
<li>Supports multiple YouTube videos per post, page or sidebar widget.</li>
<li>Set the default YouTube video player width.</li>
<li>Set the default YouTube video player aspect ration.</li>
<li>Automatically calculates YouTube video player height based on width setting.</li>
<li>Supports an optional per YouTube video player width setting.</li>
<li>Supports optional per YouTube video player aspect ratio customization.</li>
<li>Includes convenient admin settings page for easy configuration.</li>
<li>Includes powerful shortcode Youtube player placement.</li>
</ul>
<h3>Documentation</h3>
Basic Usage
Usage is simple. Create a new post, page or text widget add your content to it. Wherever you want a YouTube video to appear include a Nice YouTube shortcode, like the following example. When you view your published post, page or widget the shortcode will be automatically replaced with a corresponding YouTube video.
Shortcode Example
<pre><code>[niceyoutubelite id="UXtjrb0WBhc"]
</code></pre>
Note, id is the YouTube video id of your video.
Shortcode Syntax
[niceyoutubelite attribute_name=”attribute_value”]
Shortcode Attributes
The Nice Youtube Lite plugin provides options through the inclusion of 3 shortcode attributes. These attributes are as follows.
<ul>
<li>id</li>
<li>width</li>
<li>aspect_ratio</li>
</ul>
Each attribute can be set in the shortcode by including the attribute name followed by an equals sign and the attribute value in quotes. You can set a default value for all of the attribute, excluding the video “id”, on the admin settings page.
Attribute Example
<pre><code>[niceyoutubelite id="UXtjrb0WBhc" width="320"]
</code></pre>
Shortcode Attribute Definitions
id
[niceyoutubelite id=”YouTube_Video_Id”]
Sets the video id for the YouTube video you wish to display. The YouTube video id is displayed in your browsers address bar when you are watching a video on YouTube. To obtain the video id, go to your video manager on YouTube and simply play your video. Look at your browser’s address bar. You will see a web address that looks like the following.
<pre><code>http://www.youtube.com/watch?v=UXtjrb0WBhc
</code></pre>
The portion of the address after the “v=” is the video id.
Example
<pre><code>[niceyoutubelite id="UXtjrb0WBhc"]
</code></pre>
Notice that the id value is the same as the value that comes after the “v=” portion of the YouTube video URI.
width
[niceyoutubelite width=”640″]
Use width to set the YouTube video player width.
aspect_ratio
[niceyoutubelite aspect_ratio=”16:9″]
Set the YouTube video player’s aspect ratio with the aspect_ratio attribute. The default YouTube video aspect ratio is 16:9. Older videos probably have an aspect ratio of 4:3. The aspect ratio and width settings are used to automatically calculate the appropriate height for the YouTube video player.
Plugin Settings
The Nice Youtube Lite plugin allows you to configure the plugin’s global default settings. Configuration of the plugin is made quick and easy through the use of it’s admin settings page. You can find the settings page at WP-Admin>>Settings>>Nice Youtube Lite. The global default settings that are made available to you are as follows.
Default video width
Enter the default YouTube video embed width in pixels. This will be used for all videos that do not have a width set in their respective shortcodes.
Default video aspect ratio
Enter the YouTube player aspect ratio. This will be used to determine the height of the video player. YouTubes standard aspect ratio is 16:9. Older videos may have an aspect ratio of 4:3.

Nice YouTube Lite

Nice YouTube Lite gives you the power to embed YouTube video players wherever you choose, by simply adding shortcodes to your posts, pages or sidebar  …

UjW0L

This plugin lets you to display Youtube widget on sidebar with the themes that supports sidebar and Footer
It displays video and playlist of your choice with video id and playlist id. 
It also lets you display all videos from you youtube channel with option to navigate to next nd previous button. 
No google API key needed. Uses Youtube rss feed.
You have choice between single video , playlist and channel.
Note:

Simple Youtube Widget

Plugin that provides users option to display Youtube Widget on the Sidebar or Footer

Nice YouTube Lite vs Simple Youtube Widget