There’s currently no way to query streams by tag id, you would need to request all streams (potentially limited to specific streamers, games, or languages) and then filter based on tag your end.
There is a feature request on UserVoice for this to be added, so if this is something you want to have added you should vote for it here: https://twitch.uservoice.com/forums/310213-developers/suggestions/40154632-api-for-filtering-by-tag