Thanks. So far I found a few brief histories on Google which talk about the Confusion school, Buddhist school, Taoist school, medical qigong and martial qigong. Although I have read that qigong was originally taught to Shaolin monks by an Indian Yogi I have not heard of Vedic or Hindu qigong. But I did hear Sri Sri Ravi Shankar once say that acupuncure originated in India and that there was still a family who preserved the original tradition in India.
There is too much correlation between kriya yoga and qigong to be coincidence. When Yogananda originally published his "Tissue Will System of Physical Perfection" later called the "Energization Exercises" it was a direct type of qigong designed to bring qi into the body and direct it with will for a purpose. His kriya yoga techniques involve circulating chi around body up the back and down the front through the centers some say using a mantra of Vishnu with syllables corresponding to each chakra. Then when I got the Spring Forest qigong course about 6 years ago I discovered that he teaches the same thing. Of course Master Chunyi Lin could be a practitioner of kriya yoga but more likely it is a part of qigong tradition since the "microcosmic orbit" seems to be central in many forms of qigong.
Also the placing of the tongue on the palate is part of the microcosmic orbit in order to complete the circuit but there seems to be some other purpose of the kechari mudra in kriya yoga which seems to be to awaken the pineal gland for enlightenment or contact with higher consciousness.
Now after learning a number of different qigong forms I see some common aspects between a lot of qigong and yoga in general. The meaning of "pranayama" is close to the meaning of "chi kung"
I'm starting to see some connection between wudang qigong and the kriya yoga. Interestingly some practitioners of kriya yoga seem to be led in that direction also such as MIchael Winn and some of the followers of the Dragon Gate Sanctuary.
Both lineages claim to originate in Tibet which is also interesting.
I'm sure many others have done a lot of research and training in qigong and know a lot more about the real history.