Are you just wanting some free program, or one that you can use to produce pro quality?
I've used many editors, some costly, and some not so. The manufacturers have been tailoring to the large consumer base recently. So they're providing some great programs that are very affordable. The "pros" have almost taken a back seat. One such program was produced by Ulead (long ago purchased by Corel), MediaStudio Pro. It ranked up there with the big dogs in video editing software. However they discontinued it since not enough market demand.
Corel offers VideoStudio, which I've used since before Corel gobbled it up. It was formerly Ulead VideoStudio. It is a fantastic program, easy to use, and edit about all video files available, and can produce very professional results. Currently,VideoStudio Pro X8 full version (not upgrade) is only $63.99.
I've used this product since version 5.
From the System Requirements for VideoStudio
..
Digital Single-Lens Reflex (SLR) cameras for stop motion: EOS-1D Mark III, EOS-1D Mark IV, EOS-1Ds Mark III, EOS 1D X, EOS-1D C, EOS 5D Mark II, EOS 5D Mark III, EOS 6D, EOS 7D, EOS 40D, EOS 50D, EOS 60D, EOS 60Da, EOS 450D/Rebel XSi, EOS 500D/Rebel T1i, EOS 550D/Rebel T2i, EOS 600D/Rebel T3i, EOS 650D/Rebel T4i, EOS 1000D/Rebel XS, EOS 1100D/Rebel T3, EOS M
I know it says for Stop Motion, however it also is capable of handling the video files.
I've also used Magix Movie Edit Pro
picked up when Corel discontinued MovieStudio Pro. It's a good editor too, however a little more complex and costs more.
Sony makes some outstanding editors, for the pros and hobbiests. Sony Vegas Products
.
Each one of those do offer free trials. Find one that looks appealing, meets your needs, download the trial and decide.
Video editing software is like photo editing, it depends on what you need it to do.