http://www.labnol.org/internet/add-logo-to-youtube-videos/25948/
Would you like to add some branding to your YouTube videos? Maybe an overlay logo or some sort of a watermark image that is permanently displayed in one of the corners of the video (similar to TV programming).
You can use any video editing software to add logos or watermarks to your videos before uploading them to YouTube but how do you put them in your existing videos that are already on the web?
Well, YouTube has recently added a new feature called InVideo Programming that will help you add any custom image to all your Youtube videos with a few clicks without having to edit the original video.
Put a logo inside your YouTube Videos
The image can be your brand’s logo (make sure it’s a transparent png) or use one of these YouTube buttons to promote your main YouTube channel inside all your videos.
You can choose to display the logo at the start of the video, somewhere in the middle or even for the entire duration of the video. Also, the logo can be placed in either corners of the YouTube player.
That said, YouTube internally uses annotations to display the images over the video and thus, if you a YouTube viewer has turned off annotations, your logo won’t be visible.
Thanks Ashish Mohta for the tip.