Example

function smushImages($image_path)
{
    $imagick = new \Imagick(realpath($image_path));
    $imagick2 = new \Imagick(realpath("images/coolGif.gif"));

    $imagick->addimage($imagick2);
    $smushed = $imagick->smushImages(false, 50);
    $smushed->setImageFormat('jpg');
    header("Content-Type: image/jpeg");
    echo $smushed->getImageBlob();
}