Get the video from the Blink cloud onto a screen MUCH bigger than your phone. Use the share choice, email the video to your laptop/computer. Using that much bigger screen, you will probably be able to make out details for identification purposes.
If you have a tablet, put the blink app on that. You can use Blink on many devices with just your one existing account. Simply login via same user name and password. A tablet is a large screen good enough to identify faces, license plates, etc.
Be advised and expect frustration that your video captures everything perfectly except the good little detail you are looking for to nail someone. Welcome to security cameras. This happens will all the brands.