import moviepy.editor as mp
video = mp.VideoFileClip("video.mp4")
logo = (mp.ImageClip("logo.png")
.set_duration(video.duration)
.resize(height=50) # if you need to resize...
.margin(right=8, top=8, opacity=0) # (optional) logo-border padding
.set_pos(("right","top")))
final = mp.CompositeVideoClip([video, logo])
final.write_videofile("test.mp4")