Video Embed & Thumbnail Generator is a plugin for the WordPress visual editor by kylegilman to make embedding videos, generating thumbnails, and encoding HTML5-compliant files a little bit easier.
The plugin adds a button to the visual editor in WordPress. The icon has a generic man & woman icon with a camera between them. Press the button to open the plugin’s dialog box.
Example of a fully-filled dialog box.
The author says; “For now you’ll have to upload the video separately, then enter the URL into the Video URL box. The embedded player will default to a Flash video player, so it should be a Flash Video compatible file. You should be able to use FLV, but I haven’t tested it, so I strongly recommend H.264 video and AAC audio in an MP4 container. If you’re using Apple’s Compressor, the “Streaming” setting should be “Fast Start” (NOT Fast Start – Compressed Header).”
Download and more info: http://wordpress.org/extend/plugins/video-embed-thumbnail-generator/