Youtube offers a lot of parameters, that you can use in the video embed code, to have full control over your videos. Below are some links and a list of these parameters. All of the player controls for any YouTube player can be found in this Reference Doc.
Thanks to user jeffhd1ckey for submitting this idea!
Here is a list of the functions:
Parameters
autohide
autoplay
cc_load_policy
color
controls
disablekb
enablejsapi
end
fs
iv_load_policy
list
listType
loop
modestbranding
origin
playlist
rel
start
theme
Deprecated parameters only used in the AS2 Player API