The /ʒ/ sound occurs initially in a handful of loan words from French such as gendarme, medially in derivatives such as collision, in a few words ending in -ure such as leisure and treasure, and finally in a few words of French origin such as luge and rouge. It is the rarest of RP phonemes, occurring in only 334 words in the Mitton dictionary.
Since it does not enter any consonant clusters, there are hardly any instances of its making a minimal pair with a vowel. However there is one case of /ʒ/ versus /ɪ/
luge Louisand one of /ʒ/ versus /eɪ/
rouge rouéThere are also several cases where changing /ʒ/ to /ɪ/ yields a new word with /eɪ/. Whether these could be called minimal pairs is doubtful.
leisure layer leisured layered pleasure player