Triggering BPM Process Using Visual Composer

Dear All

I have a BPM Process with which is working fine.

Now I want to trigger this BPM Process when a user saves a form developed in Visual Composer. I know there is an option to trigger your BPM Process manually from Process Repository but in real scenario this will not work.

Exact requirement is to trigger different BPM Processes once user fills the first Form and submit. VC Forms can be published on EP using iViews.

Any step by step tutorial will be helpful.