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As of 4.0.1 you can set CAP_PROP_CHANNEL property. This is the switch case for the property:

void videoInput::setPhyCon(int id, int conn){

    switch(conn){

        case 0:
            VDList[id]->connection = PhysConn_Video_Composite;
            break;
        case 1:
            VDList[id]->connection = PhysConn_Video_SVideo;
            break;
        case 2:
            VDList[id]->connection = PhysConn_Video_Tuner;
            break;
        case 3:
            VDList[id]->connection = PhysConn_Video_USB;
            break;
        case 4:
            VDList[id]->connection = PhysConn_Video_1394;
            break;
        default:
            return; //if it is not these types don't set crossbar
        break;
    }

    VDList[id]->storeConn    = conn;
    VDList[id]->useCrossbar    = true;
}

https://github.com/opencv/opencv/pull/12138/files/283d1c3dc4572e6f360e679dbfe3222a04f8a285 Note: CAP_CROSSBAR_INPIN_TYPE has been changed to CAP_PROP_CHANNEL