Filter categories by Taxonomies description

Hi folks.

For my wordpress site i’m looking for a solution to filter my categories by tags.

example : i have a video section with many videos, and i want my users to be able to filter them by Taxonomies.

Actually i found the solution of

mysite.com/mycategory?tag=thetag.

it works well. but now i’m looking for a solution to change

title of the page, and add a description.

Do you know any developpement or plugin that might help me ?

i was thinking of make php like is_category(is_tag()) { }

but i’m not really fan of adding php directly in my theme i would appreciate to do it thru admin.