Having a lot of trouble 3D tracking this shot and was wondering if anyone could maybe help me out and give me some advice. I have linked the clip below and want to do a 3D camera track so I can place 3D text using Element 3D in the entrance way between the silhouette wood posts in the foreground but when I run a 3D camera track all it will track is the trees in the background. I thought this would be a pretty simple track and I have even tried masking out just the bottom of the shot but then the camera wont solve. Any advice would be greatly appreciated! Also sorry if I posted this in the wrong place. didn't really see a forum that revolved around just general advice in the community.
The clip: http://www.mediafire.com/watch/ei4ualrdtl37krr/BEN_3.mov