And here you can read more detailed description of the site you linked to:
http://actualhistory.ru/melnikoff

It seems that the chief editor behind this site is a known falsifier photographer Leonid Melnikoff.

And here is the explanation of the video:

Для начала определим, что представляет собой запись. Смертная казнь через повешение была введена в СССР 19 апреля 1943 г. для изменников и военных преступников (т.о. относительно «коллективизации» — бред). В ролике имеет место монтаж из съемок двух разных экзекуций. В первом случае вешают полицаев, а там где на табличках видны фамилии осужденных — казнь убийц из зондеркоманды СС-10-А в Краснодаре в 1943 г.
So the video is glued from two pieces, the first is the execution of the "polizei", and in the second part is the execution of the Sonderkommando SS-10-A in Krasnodar. Capital punishment was introduced for traitors and war criminals in the USSR in 1943.

Sonderkommando SS-10-A is known for many atrocities including murdering 214 children in gas vans http://eysk.net/history/zonderkomanda.html

The events showed in the video were never covered up and the descriptions were published in the books. Regarding the claim about cross-street ropes, it is completely made up by Melnikoff.
Regarding "medieval practice" it is said that in France for example, all executions werre mandatory public until 1939. In the USSR this was only a war-time exception.