It works great but asked for category ID here is how I solve it

[SalimF]

Hello I was searching, I found solution by changing $params default array to this

$params = array
(
    'title' => 'title example',
    'description' => 'description example',
    'tags' => array
    (
        'tag1',
        'tag2'
    ),
    'status' => 'private',
    'category' => '1',
    'video_path' => 'example.webm'
);

These categories list https://gist.github.com/dgp/1b24bf2961521bd75d6c
the other issue I solved by creating new project on Google cloud console and enabling YT API and enable the app in options