The input videos are not checked in to github since they're over 100 MiB in size. You can download them from here: https://www.ccoderun.ca/download/media/
Assuming you've downloaded the example input videos described above, run the following commands to build and run the CSRT example on Ubuntu:
sudo apt-get install build-essential cmake libopencv-dev
mkdir -p ~/src
cd ~/src
git checkout https://github.com/stephanecharette/CSRTExample
cd CSRTExample
mkdir build
cd build
cmake ..
make
./CSRTExample input_3733.mp4