A gerund phrase consists of a gerund and any modifiers or complements the gerund has. The entire phrase is used as a noun.
Examples: Holding a class election taught us much about politics. [subject of the verb taught]
When did the candidates begin campaigning for the class offices? [direct object of the verb did begin]
Carrie’s passion is rock climbing. [predicate nominative identifying the subject passion]
Javier gave fishing for bass another chance. [indirect object of the verb gave]
Election officials made an error in counting the votes. [object of the preposition in]