ffmpeg - blend video with images
The blend filter requires both inputs to have the same resolution. You can use the scale2ref filter to resize the overlay.

ffmpeg -i dogs.mp4 -i red.jpg -filter_complex '[1:v][0:v]scale2ref[ckout][vid];[vid][ckout]blend=all_mode='multiply'[out]' -map '[out]' output.mp4