Plane Tracking Tips

I was wondering if any of you had some good tips for plane tracking. More specifically plane tracking something that then goes off screen at some point (say you’re replacing a poster and the camera is panning and the poster you’re replacing ends up off the screen)

I liked this tracking tut and they specifically cover pans, and disabling off screen markers.

[video]https://video.search.yahoo.com/video/play;_ylt=A2KLqISPsF9VjjgA5PQsnIlQ;_ylu=X3oDMTByZW c0dGJtBHNlYwNzcgRzbGsDdmlkBHZ0aWQDBGdwb3MDMQ–?p=blender+tracking&vid=8ca854f3c8404e64e96d7cf126 aa13c4&l=1%3A54%3A10&turl=http%3A%2F%2Fts4.mm.bing .net%2Fth%3Fid%3DWN.C1CQ%252fAnodgpCPRi0PcN%252fFQ %26pid%3D15.1&rurl=https%3A%2F%2Fwww.youtube.com%2 Fwatch%3Fv%3D5HvLTJ4Zgo0&tit=How+to+do+Camera+Trac king+in+Blender&c=0&sigr=11bnn3a88&sigt=1148agh6m& sigi=123hmk5bc&age=1363039979&fr2=p%3As%2Cv%3Av&fr =yhs-mozilla-001&hsimp=yhs-001&hspart=mozilla&tt=b[/video]