I want to thank Mac McIntosh for this helpful tip.
Kinovea is a free and open source solution for video analysis.
It is mostly used by sports coaches and athletes to explore, study or comment a performance.
In addition to this primary focus, Kinovea is also used by animation artists, podiatrists, and ergonomics engineers.
Visit http://www.kinovea.org/en/ for more information.
The integrated file explorer lets you browse your video collection visually. Supported files are displayed as animated thumbnails. A shortcut manager lets you save bookmarks of frequently accessed directories for faster lookup
A dual screen mode allows you to compare two performances side by side. Videos can be synchronized on a common event for dynamic comparison.
The line and chronometer tools let you measure distances and times. A semi-automated tracking tool let you follow motion path and measure speeds.