I dont think there is a setting in AC.
I once wanted to study one corner and uses Nvida Shadowplay to capture a video of that corner and then used a video processing utility to process it and turn the video into an exe that loops. The tool: http://www.radgametools.com/scripts/binkver.asp?win64&ver=2.4k/1.994k
You have to install and run radtools, select your video, poke Blink it! (video processor ) to create a *.blk file and then select that resulting file and poke advanced play. Llook for the check box "Loop the playback" and then poke Make EXE. This will create a program (*.exe) that you can play and it will loop. You can do some trimming in the blk step and you can select the frame rate in the playback step before building the exe.
Else just set the GREEN "bookmark" sliders in the replay to make the start and stop points and poke
PLAY and STOP over and over.