If you found this code injected in your source code, is because this plugin is infected. I have 4 websites and all 4 of the use this plugin.
I hope plugin's developer didn't do this on purpose.
It's on file my-videotag.php on line 88.
You can click on this it's harmless, just code repository.
this is the eval script.
[removed - do not post that kind of code here, please]