Sadie's Home' is [a family-friendly movie told from the perspective of
a little girl called Sadie].
Yes: "told" is a non-finite (past participle) verb and told from the perspective of a little girl called Sadie is a past-participial clause modifying the nominal "family-friendly movie".
It is semantically similar to a relative clause: compare a family-friendly movie that is told from the perspective of a little girl called Sadie.
Past-participial modifiers are 'bare passives', as evident from the admissibility of a by phrase in complement function.
It is not analysed as some kind of relative clause as there is no possibility of it containing a relative phrase (compare the ungrammatical a family-friendly movie which told from the perspective of a little girl called Sadie).