This video, titled "Komatsu PC78 Feller Buncher Building a Work Path [High-performance Forestry Machinery]" (コマツPC78フェラーバンチャザウルス作業道開設【高性能林業機械】), was released by Fujioka Forestry Co. (株式会社 藤岡林業).

The Komatsu PC78 Feller Buncher is an attachment that makes digging, cutting, and grabbing possible with a single backhoe.

In other words, it makes it possible to perform a wide range of tasks in a single machine, including wood cutting, trenching, etc.

In the video, you can see how it can cut down a standing tree, pull out the roots, and dig up the soil.
The strong rotator makes it possible to fell trees while climbing up steep slopes.