Story : Dhammapada Verse 46
This is story of a monk who had taken up ‘mirage’ as an object of meditation. The story corresponds to Dhammapada Verse 46 from the chapter on Flowers (Pupphavagga).
The English translation of this verse by Acarya Buddharakkhita (alternate translation by Ajahn Thanissaro) is available at accesstoinsight.org :
https://www.accesstoinsight.org/tipitaka/kn/dhp/dhp.04.budd.html.
An English translation of this story is available at :
https://www.ancient-buddhist-texts.net/English-Texts/Buddhist-Legends/04-02.htm.
The sutta referred to in the above video - Pheṇapiṇḍūpamasutta (simile of the Lump of Foam), and its translation can be read at :
https://www.digitalpalireader.online/_dprhtml/index.html?loc=s.2.0.0.0.9.2.m.
The English translation of this sutta by Ajahn Thanissaro is also available at :
https://www.dhammatalks.org/suttas/SN/SN22_95.html.