Kapur took to micro-blogging website Twitter on Wednesday to express his thoughts about the film.
"Travelled 3 hours to see #Piku in LA. Totally worth it. Best Hindi film I have seen in a v long time @deepikapadukone @SrBachchan @irrfan_k," the 69-year-old tweeted.
The film tells a tale of a Bengali father and daughter duo.