Even though the Android sdk itself comes with apache v2.0 license, on the website at the terms & conditions - Terms and Conditions - OpenCV under License for use of products it says
All Products available for sale on the Website were developed solely for your personal use and may not be reproduced for publication or for the personal or commercial use of others without permission.
Hope this would not prevent from developing a feature for a client with Opencv Android SDK embedded.
Thanks in advance