Is this Ash tree in poor health? I'm planning to landscape the back garden and a lot of the design is based the location of the tree. I searched google and the best I could find is cankers or ash die back. This is another similar hole on the other side and also a branch that looks similar to the image attached.
Video of tree: https://www.youtube.com/watch?v=ahnPLYLI1VY
Image: https://www.flickr.com/photos/exetertrees/28437393838/in/photostream/
by ApprehensiveEye9902