I need help to find out what the name of a chord is.
It seems that with the left hand, the guy (in a video)
plays an A
7 (or maybe some kind of dimished?) chord
and in the right hand he plays a C, F
#, B.
Thus, the entire keys played are C, D
#, F
#, A, C, F
#, B.
In the song, the progression chords are a II-V-I in G Mayor. The song progession begins as Am, D, G, Em, and at a point in the progression where the V chord D comes in, he plays that chord I mention.
Although not too clear, I made a video capture at the point where he plays that chord, so I attached it in this message so that my words turn into pictures

.
I'll appreciate all the help with figuring out what this chord name is.
thanks,
Valentin