Function gstreamer_editing_services_sys::ges_clip_add_top_effect

pub unsafe extern "C" fn ges_clip_add_top_effect(
    clip: *mut GESClip, 
    effect: *mut GESBaseEffect, 
    index: c_int, 
    error: *mut *mut GError
) -> gboolean

This is supported on crate feature v1_18 only.