I hope the title explains it all, but is it possible to give certain person access to gamepass if yes, then could anyone help with it?
You cannot give a game pass for free. The target user would need to buy it. But, if you want them to use the game pass features, just check who joined to give them the game pass features.
Here is some pseudocode
local function game_pass_features(target) -- TODO: give them game pass features end when player joins check their user id or name (prefer user id) if they are who you want or they have the game pass game_pass_features(player)