YouTube Player
The Themekit video player displays a YouTube video in this example and has the option to use a dark or light skin
The player is set for 16:9 aspect ratio video files by default but this can be changed for other aspect ratios such as the old 4:3 and cinema style HD formats.
There is an option to insert the video title in the same container for better SEO.
Video Hosting
Self hosted video is much better than YouTube video for use on responsive pages. YouTube video requires extra server requests and, in its standard form, cannot offer the option for high and low resolution videos.
YouTube to MP4
Don't force your mobile visitors to download a large file. Convert YouTube to MP4 and offer two versions - SD and HD.
Grab the YouTube URL, open the online downloader in the browser, paste in the URL, convert and download the MP4.
The standard file used in the example is 426 × 240px with a file size of 8MB and the HD file is 854 × 480px with a file size of 23MB.