P.I.P.
I guess you mean a bent arm pullover, by the video you included. The elbows are usually at a 90 degree angle at the full stretch position. As with any pullover, straight arm or bent, the full stretch is very important. With the bent arm version it's kind of hard to stop about head level, but if that works for you, great. With the straight arm version, that is the usual stopping point, than lowered back down again for the stretch.
Some guy's will use DB's, rather than a BB, with the bent arms because it can give less stress on the wrist, elbows and even the shoulder. A swing bell also works well with the straight arm version (elbows slightly bent). Decline pullovers can be very good. You might make sure the bottom position of the decline bench is high enough above the floor to allow a full stretch.
One of my favorite exercises is the bent arm pullover and press. A mass builder for the upper body, which hit the lats, pecs, triceps, delts and even the Abs. Can work up to some impressive weight in this movement.
Just to note: the Ab Roller (an exceptional tool for working the complete ab wall) may be considered a form of the straight arm pullover, but facing down (pull under?). Front lat pull downs also hit the lats very well, from the bent over to standing position. The standing position will not give the full behind the head stretch that regular straight arm pullovers will. Good Luck.