These endless swimming pools are quite nice, especially if combined with a front snorkel depicted in the second picture. This way you could practice a perfect freestyle swimming stroke without being distracted with flip turns or breathing. However, Let's get back to our front view freestyle video analysis.
I am not sure who this person is, but I'll point out a few obvious bad mistakes he is doing, so perhaps he will appreciate this review. First, play the video all the way through and then play it again and try to figure out yourself what he is doing right and what he is doing wrong. Then click below to see the entire post to see if you correctly identified some of the most common freestyle stroke technique mistakes.
OK, here it is:

2.) Imagine a line going through his body which would split him in two halves (right and left). Now check out his hands and where they enter into the water. The hands should never reach over to the other half (passed the axis). This causes the swimmer to snake through the water instead of going in as streamlined of a position as possible.
3.) From our view, the left hand is tilted with the palm out when it enters the water. That shouldn't really happen. He could catch a lot more water if he would point his palm more toward the bottom of the pool. Also, such a hand entry is the major cause of shoulder injuries, so be careful here.

5.) I'd also like to point out that the hand on the left from our view, when in the water, goes too far to the left when grabbing the water. He should concentrate to go more under his body with his arms, thus putting less stress on his shoulder and being more streamlined.
I am sure you can think of a few more things that are wrong with the video. Please don't be shy to share them with me on the comments section. To get you started on your way to effortless and efficient swimming, check out the introduction to better body and head position in the water while swimming freestyle.