Learn to maximize the size of the YouTube Player. We can maximize the player by clicking full screen Button on the bottom right corner of the player. That let you to maximize the window size to the maximum resolution of your monitor.
We can change the Player size by just adding single word to the Video URLs. This can be done by using simple hacking tricks. the normal YouTube link should be.
By the Link above you can see full screen video and If you want to maximize the size of the player alone then add ‘ _popup‘ to the URL of the particular video after watch. you can change the size of the YouTube player.
The size would be the full browser window size not full screen resolution of your monitor. Once added then your link will be.
After enter your video is ready to play in full browser size. then you can notice the change in URL of the same video is like