LucP

Featured video allows you to add a YouTube or Vimeo video to one of your posts and get to it using the shortcode [featured-video], 
next to that you can also embed it right in the code of your theme with the_post_video()!
the_post_video() returns your video standard with a 560×315 resolution. You can pass along the width and height, if 
you would like to change this, so: the_post_video(600,400) will return the video with a resolution of 600×400.
Next to the width and height you can pass along the window mode (only for youtube) which defaults to transparent. 
You can also edit the ‘allowfullscreen’ variable of the iframe. So a featured video with different width, height, 
windowmode and allowfullscreen would be: 
the_post_video(600,400,’window’,”);
There are a few other functions you can use in your theme (all parameters are optional):
<pre><code>has_post_video(post_id) // same as has_post_thumbnail(), returns true or false.
get_the_post_video(post_id, width, height, windowmode, allowfullscreen) // will not echo the video. Has the option to pass a post_id 
the_post_video_thumbnail(post_id) // show the video thumbnail
get_the_post_video_thumbnail(post_id) // will not echo the video thumbnail directly.
the_post_video_image(post_id) // get the big version of the thumbnail
get_the_post_video_image(post_id) //will not echo the video image directly
</code></pre>
This plugin currently only supports YouTube and Vimeo and works with the url’s of single video’s.

Featured Video

Featured video is exactly the same as a featured image. It allows you to easily link a YouTube or Vimeo video to a post.

sewpafly

To meet the needs of themes where the post-thumbnails have random and capricious sizes (which causes wordpress to crop images simply from the middle (either chopping off the top and bottom or chopping off the sides), this plugin attempts to give the users an interface to manually fix those thumbnail and random images.

Post Thumbnail Editor

Does not work

Fed up with the lack of automated tools to properly crop and scale post thumbnails? Maybe this plugin can help.

Featured Video vs Post Thumbnail Editor