Alternatively, if you are creating the theme yourself and/or can modify it, you can create an action yourself using WordPress' do_action function. This is also how they create their other hooks. So basically in your theme, you would go where you want to, right after the <body> tag, and do something like:
do_action('after_body');
You can also pass arguments to the action callback, see the linked documentation for information.
Then afterwards, you would simply use the add_action function to hook onto it.
add_action('after_body', 'my_callback');
Hope that helps. Sorry if I misunderstood.
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