How can I make a search bar to search youtube channels

I have true mag theme installed and everything is working perfectly
But my site is a hub for several youtube sites.
It makes my work very easy since I upload to youtube and just emmbed the playlist codes in my site
But this just limits my search on the site to the posts make in my site.
I want to make the search bar to search only in given channels of youtube.
youmax plugin has something similar.

I wish to make a search bar or modify my existing search bar or even get a plugin. Willing to buy the plugin if it works.
Thank you